Actually, it was Carol which in few different occasions let the new avengers "slip away" from the registration forces. The entire "Tony's lap dog" thing which was thrown at her is only about the Julia Carpenter stuff, otherwise, it is really not correct.
As for new identity - I am not sure. It seems that she will have new civilian identity: Cathrine Donovan. Also, the return of Binary powers was teased (cover to Ms. Marvel # 37) so maybe she return to Binary name as well?
Your hypothesis on the goblin formula is unbased as well. Did you really forget this:
Or maybe, like most sane people, you just want to forget this?