Who knows. I won't be surprised if they pulled out a Reaper/Nameless in one of the teaser or left it as hidden.
Its still a "raptored" issue though in a way. Desert or not desert, it doesn't change the fact they had "raptored" SE design.
The main issue is that given the fact you need its engram... PLUS the fact that Cryopod/Cryofridge not only require power, but it may only be craftable with Earth-only material makes it less likely for people to use it elsewhere... especially some griefing tribe in PvE who only wants to cap the server for their own selfish benefit and nothing more.
In a sense, it won't fully solve the issue, and in some server's extreme case, not at all.
It most likely won't be boss-only tekgram since the only "bosses" we need to deal with are titans in Earth, but seeing the design concept so far, I bet it (Cryofridge) would require something that will serious annoy everyone off by being hard/rare to get.
Anything can change without warning. You won't know if they would keep their word on this.