Ultimate Marvel Vs Capcom 3 will add a story mode that explains why characters like Doctor Strange, Nathan Spencer, Chris Redfield, Hawkeye and Sir Arthur are present in the same game.
The roster will be expanded with a couple more characters: Mega Man X, Captain Marvel, Thanos, Gamora and Black Panther.
It will also alter a little the game mode, with only 2vs2 battles, and also it doesn't support gameplay with some characters, but they're only a few, like Dante, Iron Fist, Amaterasu or Viewtiful Joe.
The name of the update is Marvel vs Capcom: Infinite, and it'll be available for Microsoft Windows, PlayStation 4 and Xbox One, the cost will be $60 dollars.
I think it's great to see Capcom's still supporting their past MvC game, it also makes me interested in seeing how different and innovative a Marvel vs Capcom 4 will be.