On Gametrailers, you can watch the latest episode of GametrailersTV, which has a LOT of gameplay footage of MK vs. DC. And holy crap, I think it looks awesome.
Sure, it's no Soul Calibur, and this game won't be at the elite gaming competitions out there, but I don't care. It looks fun, damn it. I love Mortal Kombat. I love DC. I'm gonna love this game. Believe it or not, I had fun with Deadly Alliance and Deception (never played Armageddon), so if this game plays anything like those, then I'm gonna be satisfied. Like I said, I'm not expecting Soul Calibur or Tekken or even Dead or Alive (and anyone who is/did probably doesn't like Mortal Kombat in the first place).
Actually, there's one thing that could disappoint me...if Lobo isn't in this game, I will be pissed.
I can't wait 'til E3!