Capcom says there are more characters on the way, if I had to guess, they'll be DLC.
More characters to be announced for Marvel vs. Capcom 3 : News : EventHubs.com
Hopefully Frank will be announced.
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Shacknews confirms more announcements are on the way, within a couple of weeks.
Shoryuken - Confirmed! More Marvel vs Capcom 3 Character Announcements Incoming