You are correct. In the announcement, they stated the program launched with the center map in May. They go on to say:
"Following that we’ll be working hard to introduce more of your favourite mods to the game with Primitive+ (already an Official Mod on PC)."
So it will released further out, eta August as you pointed out earlier. Glad you posted that, I think a lot of people were hoping/anticipating for it to be released with the map. Primitive + will be great on the center when it comes though. Can't wait.