This is complete speculation on my part, so take it for what it's worth, but...
Capcom is going to show off something at New York Comic-Con. Yoshinori Ono, one of the main people responsible for the revival of Street Fighter, has been hinting really heavily at a
new Darkstalkers for quite a while now. If it were to be made I'm sure we could expect it on Wii U.
What I'm wondering now, though, is
if we'll get a version of Street Fighter x Tekken. I've owned the game on PS3 and, for some understandable reasons, it had a bit of a lackluster reception. They've been slowly tweaking it and have hinted that some pretty wide encompassing changes to the game mechanics are coming, yet they seem to be really secretive about it. At this point I wouldn't be surprised if they were looking into releasing it as a full-on version update (similar to SFIV -> SSFIV -> SSFIV AE), and take the opportunity to port it to Wii U. After all, Super Street Fighter IV released at the 3DS launch and saw quite a bit of praise. I'm sure they'd want to take advantage of that again, add to that the fact that TTT2 will be introducing a lot of Nintendo fans to that franchise for the first time.
Everything just seems to fall into place really well. But of course, it could be anything really. Just a guess.