I'm gonna have to finally come out and be "that guy" in this thread.
Never thought this would be something I could say, but I have a line of communication with Monster, and while I can't confirm 100% it's DKR2, I can confirm, perhaps well outside my comfort level, that they're working on something for the WiiU that is pretty much talked about by everyone involved as the most exciting thing to be done on WiiU yet, and that they are certain it's going to blow people away upon reveal.
I genuinely wasn't told details because while I may want to know, I don't trust myself with that much knowledge, so it's likely best they didn't either.