Here are the last notes themselves and my interpretation:
"The background levels of Element are way higher on this Ark. I wonder whether that was part of the plan -- to see what you survivors would do with Element if you had access to it.
Or maybe… maybe it’s the reverse. The plan was to see what Element would do if it had access to survivors. That’s the thing about Element: it adapts to whatever it’s in contact with. If you aren’t careful, Element can corrupt you. But I know you’ll be careful. After all, we made it this far, eh?"
"When things got really bad on Earth -- wars, Element corruption, all sorts of troubles -- humans thought of all sorts of ways to escape.
One way to escape was homo deus, another step in human evolution. Another way -- from a certain point of view -- was these Arks. And the Genesis simulation was another escape plan.
You survivors, though, you’re made of tougher stuff. You adapt and endure, rather than running away."
"I wonder whether there are no humans anywhere on Earth anymore -- other than you survivors, of course. No sign of them anywhere on my scanners. Earth’s a big place, of course, but you’d think there’d be radio signals or something to let us know we aren’t the last ones on earth.
And if there are no more humans, where’d they all go? Did they do each other in, or did the titans get them? With all you humans accomplished, you’d think there’d be a remnant out there somewhere."
"We’re pioneers, but we aren’t the first survivors to get back to Earth. Years ago, a few survivors got back -- one of whom was Helena, the survivor who made me.
They saw the same devastation you’re seeing right now, and they sought their own way to escape. For Helena, that meant ascending and becoming Homo Deus -- an energy being beyond our reality. For her friends, it meant a long journey to a place called Arat Prime, where they figured out a way to beam Helena into the Genesis simulation. And then she made me!"
"Once Helena’s friends beamed her into the Genesis simulation, she made me. But then she left. I guess homo deus beings can’t stay in our reality -- or the simulation -- for very long.
She gave me basic access to the simulation, but not a lot of guidance beyond that.
But in watching you, I’m pretty sure what I’m supposed to do: help you out as a companion and friend. Just like Helena helped her friends, and her friends helped her. Together we’re going to master the Genesis simulation, and pass every test they give us!"
These last 5 notes are just filled with bombshells. Here are all the ones I found:
Origin of Aberration: Yes, like TinyHippo said, HLN-A is just "guessing" when she says that Aberration was an experiment, but since the notes are meant to tease the true story behind the DLC, I think it just works best that even if she's "guessing" it will end up being 100% true. That being said, HLN-A reveals in the 11th note that Aberration was used to test the affects of element on various creatures. This actually explains why Diana and friends -people who are very experienced with tek- happened to end up on an ark filled with element - they were being tested to see what they would do with it. Speaking of testing, we also already know that the ARKs were being used to test early iterations of creatures found in the GenSim. So, we have the ARKs being used to test creatures found in Genesis as well as test the affects of element on various creatures. And of course we already know that the ARKs as a whole are meant to preserve humanity and if necessary train survivors for Extinction. My question is, why and how are the ARKs and GenSim connected aside from both being different methods of saving mankind? Why were the ARKs testing things used in the simulation? Why was Aberration experimenting with element?
Homo Dei: This one is pretty simple - HLN-A describes Homo Dei as "an energy being beyond our reality", which I think is the best description we've gotten of them so far. Also, HLN-A says that Homo Dei can't in either our reality or the simulation for very long. You can interpret that as you wish, but to me it seems that a Homo Dei is someone with an advanced nervous system that, when met with a special raw cosmic energy, overcharges it to the point of breaking the bounds of reality as we know it.
GenSim/Fate of old humanity: Am I the only one who thinks notes 12 and 13 have much huger implications than what they may seem? I mean, in note 12 HLN-A is talking about the GenSim and how it was another method of running from the corruption, and then the very next note she's pointing out a lack of bodies and other remnants of humanity. To me this is a clear indicator that humanity's plan was to launch the ARKs, upload itself into the simulation, and then simply wait for the ARKs to land and conditions in "reality" to improve. I mean, it sounds like a better plan than, say, launching the ARKs and jumping off a building afterwards. In fact, this could also be supported by the two tek structures we've seen in the backgrounds of the trailers. Also in fact, this may explain the testing of Genesis creatures on the ARKs - they were meant to be a sort of "base template" for what would be put into the simulation. But if they did upload themselves into the simulation...where are they now? Well, I think it may be that even the simulation isn't safe from corruption. I mean, we have a skin that's literally called "corrupted avatar".We also know that the creatures in at least one area of the simulation have access to raw element (remember the Ferox), and the devs said that the simulation includes reapers and whatnot, which look like they only came to be because of raw element. So, it looks like raw element is present within the simulation. Now, the fact that Aberration was testing element on creatures suggests that even when the ARKs were being created, people were still unsure of exactly what the cause of corruption was. They may not have known that it really was element, or...I mean, Santiago knew that tek creations emit corruption particles, so...they may have had a strong suspicion, but eventually decided to deliberately ignore it because their livelihoods depended on it. Whatever the reason, I think that humanity uploaded itself into the simulation along with element and continued to make tek creations. HUGE MISTAKE. Thanks to the tek, corruption was able to spread within the simulation, and eventually was able to wipe out all humans both on Earth and in the simulation. Hence why everything is empty by the time we arrive. Also, the simulation may have never been meant for testing, but Helena made it that way to complete her mission. I still don't know what that is, but since HLN-A is with us since the Island, it seems that whatever it is is so important that she focuses on it as well as the already important task of saving humanity. As for why the creatures in the simulation are so hostile...bad programming? I mean, we know from Extinction that the ARKs became huge deathtraps because the hasty and tainted AI of the Overseers was causing loads of errors, so it's not unplausible to think the same thing happened with the GenSim. Actually the hostile creatures may be another reason there's no sign of old humanity in Genesis.
Mei-Yin/Diana/Arat Prime/HLN-A: So thanks to these notes we now know for a fact that Mei-Yin and Diana did get to Arat Prime, AP being where I believe the ARKs, Homo, Dei, and GenSim were developed. Once there they were somehow able to get in contact with Helena/OWW, who told them to upload her into the simulation. Once there, Helena/OWW made HLN-A before being pulled back. HLN-A herself looks like at least one of her purposes is to serve as eyes for H/OWW. H/OWW can't stay in the simulation for long, but she can communicate to certain entities within it thanks to the one open AP communication line. So, she created HLN-A, who can use her scanners to collect data on the GenSim's environments as well as us, effectively monitoring us and our surroundings as though H/OWW herself were. As for Mei-Yin and Diana, well, let's just say I'd be surprised if we didn't meet them in Genesis at some point.
Wording: Pay close attention to the wording at the end of the last note - HLN-A says "Together we’re going to master the Genesis simulation, and pass every test they give us!" I don't know, to me it just seems like a suspicious choice of words. Is she referring to H/OWW, Mei-Yin, and Diana?
So to recap what we know and also my ideas as to what they mean:
Aberration was used to test the effects of element on humans and animals.
Homo Dei seem to be some kind of overcharged nervous system that breaks the very bounds of our reality, and cannot stay in our reality or the simulation for very long.
It's implied that humanity uploaded itself into the simulation, and my guess is that once inside they continued to make tek, leading to them being wiped out by corruption.
The ARKs were testing real-world early iterations of creatures found in Genesis, possibly as "base templates" for the creatures in the simulation.
The simulation may have never been intended for testing, but was made that way by H/OWW.
Whatever H/OWW wants us to do is very important.
The creatures in the simulation may be hostile because of errors similar to those on the ARKs, and may be another reason there's no sign of old humanity in the simulation.
Mei-Yin and Diana were successful in getting to Arat Prime, and may meet us in Genesis.
Arat Prime may have been the development facility for not only the ARKs, but the GenSim and Homo Dei as well.
At least one of HLN-A's purposes is monitoring us and our surroundings almost as good as H/OWW herself, since she can't stay in the simulation for very long.
The wording in the last note may suggest that H/OWW is not the only being testing us in Genesis.