@Muu:
I personally love the fact that they opted for a 2vs2 structure rather than for the classic 3vs3 one. It has the potential to make everything much less messy and much more entertaining in my opinion.
I'm a bit disappointed in the likely (?) absence of the X-Guys though. They were both so iconic and unique. In particular, Wolverine embodied Marvel itself as much as Ryu embodied Capcom in the franchise. So, assuming they're actually not going to be part of the final roster, their absence is going to be a major loss for me. I also have to say that the only X-Men actually needed are, in my opinion: Wolverine, Storm, Magneto and Jean Grey. Let's hope they're going to join the rest of the characters in the end.
The current rumor is that Capcom made a compromise with Marvel/Disney. From what I heard, the X-Men won't be on-disc and therefore won't be on the packaging or any of the primary advertisements as they aren't in the core game, BUT they will be available as a DLC pack to come shortly after launch.