Okay, I could be reading into this too much (lol Eva) but due to playing Evangelion 2 on Friday, I suddenly noticed something rather...interesting.
Considering that in the Eva2 game, the characters sorta have a Rebuild look to them, maybe I'm not so off with this potential connection after all...
Just please note my camera's a piece of crap and doesn't do these pics/scenes from the game justice but at least you'll get the general idea of what I'm saying.
A sudden Bad End that can happen during gameplay/if you fail in battle is an Angel making their way to Terminal Dogma and of course, causing Third Impact.
Here, Rei is embracing the Angel as they enter Lilith together....

(For those curious, Rei is saying "Let's go home, everyone... And, let's all meet again.")

I know the second pic is hard to make out, my camera's a piece of crap. The white Angel blob is on the left, Lilith (Rei) is on the right, still embracing it. (You can see it much more clearly in the acutal game.) The words which I intentionally left in here, say "Angel (Shito) and Rei".
Does they remind you of anything? This is the fanmade Next-time Preview pic, btw.

I'm starting to wonder if those "Adams" in the Preview are simply what the Angels look like with just their souls and not necessarily anything else that's going to be "new". Basically, this theory as opposed to there being more Angels that happen to look like how they do in the Preview.
Sudden thought: Perhaps "Adams" is just the another word to describe the Angels, similar to the term "Lilin"?