Dean Ambrose will almost certainly NOT have anything to do with 1/2/12. It's as unlikely as the sun not coming up within a few hours.
The WWE does these mysterious video packages sometimes only for the return of a major star to television and the company in general. The first Raw of 2012 will probably feature the return of Chris Jericho, The Undertaker or maybe even both, but not Dean Ambrose.
Think about it, I know he has a following among the IWC but...c'mon...don't blow this guy's popularity so far out of proportion that it wanders into the realm of absurdity. IF, and I do mean IF, it was Ambrose that debuts on 1/2/12, it's going to be quite underwhelming. Why? Because the vast majority of the WWE audience has absolutely no idea who the hell this guy is. Imagine if all this build up took place, all these cryptic videos are played that are usually the promise of something epic and the Raw audience reacts with a "Who Are You?" chant.
Ambrose is a nobody right now, plain and simple. A talented nobody, but a nobody all the same and the WWE isn't going to waste all the hype and mystery of this build up on a nobody.