The latest trailer for Marvel vs. Capcom 3
has no gameplay, but establishes sides based of "Good" and "Evil" instead of which company the character represents. Tron Bonne is shown taking on the Super Skrull despite no official announcement. For the record, Tron Bonne is in the game but Mega Man is so far MIA.
Personally, the coolest part of the video is not Tron or Captain America vs. Helicopter. It's Viewtiful Joe riding into battle on his faithful steed, Amaterasu.