Marvel vs. Capcom Infinite will be releasing next year but a hot-button question is this; are X-Men and Fantastic Four characters appearing in the game? Well, if this rumor is correct, yes, they will. Ryce made this post on NeoGaf stating that the mutants and fantastic four characters will appear in the game as DLC. It is a done deal, in his words.
This is great news and likely supports the fact that MvC Infinite will be a release supported for years; this implies future characters outside of the games core launch will come to the game via DLC.