Surprised this hasn't been said yet. There's a certain somebody who's been missing from TNA and Impact Wrestling for a very long time.
CRIMSON.
It's not an add for Genesis. I don't think it's an ad for Abyss. It's just my opinion that TNA will continue the Joseph Park thing, showing him training in OVW through Lockdown, having him team with Sting in the impending Lethal Lockdown match. Whether or not they reveal him as Abyss at, or leading up to that time, I have no idea. I personally don't care; I like the Park character, but I would also like to see Abyss come back. Either way it works for me.
I also don't think it's Sting. They'll probably hold off on him until the build-up to Lockdown as well. In fact if he became like TNA's version of the Undertaker, taking most of the year off to heal up, and then putting on one or two matches per year, I'd be perfectly fine with this. He's a good draw if not used every week.
Crimson makes the most sense to me. He's been down training in OVW as well, and he'd be a good guy to show up and make an impact on the first episode of TNA in 2013. Have him kick James Storm's face off for ending his undefeated streak, and set up a match between the two at Genesis.
The other options are:
1) A big reveal for Aces & Eights
2) King Mo finally does something with TNA other than be a worthless enforcer
3) Somebody brand new (or an old face) makes their unexpected news
It's probably not going to be an Aces & Eights thing. For one, just like Abyss and Sting they'll want to stretch that shit out until Lockdown. For two, they've been keen on keeping themselves secret for quite some time; it's not in their style to have a video package and reveal themselves in grand fashion. The league of shadows works in secret, after all... And for the same reason, it's not going to be Eric Bischoff or Jeff Jarrett, who I am still convinced is behind all the Aces & Eights junk to begin with.
It's probably NOT going to be King Mo. The package doesn't fit his M.O. at all, and yes, that pun was VERY much intended.
So if it's not Crimson, we'll probably see the debut of a brand new character, or a returning face we haven't seen for quite some time. I'm sure rumors will spin in the next few weeks; info might even leak and we'll know exactly who it is. My money is still on Crimson, but if I had to take another shot in the dark, I'd probably go with somebody like Matt Hardy. He's done his time away from TNA, and seems to have gotten his life in order (again). The promo kind of fits something he'd do on YouTube. I think we'd have heard something if John Morrison was talking with TNA. Could be Awesome Kong's return, but again...I think we would have heard something. And why not go back to WWE, who has said the door is always open for her?
In conclusion, my picks in order from most likely, to least likely are:
Crimson
Matt Hardy
Armbar
Abyss
Some guy from OVW
Some guy from AAA
1004 other people
Armbar
Chris Jericho