Capcom's already on the PS Vita train, having announced its support at E3 with Street Fighter x Tekken. Certainly it must have other games prepped for the handheld, and if an Amazon France listing is correct, Marvel vs. Capcom 3 may be one of them.
It doesn't seem like that much of a stretch, given the fact that by all appearances Capcom has been able to easily port Street Fighter x Tekken to Sony's portable. But with Ultimate Marvel vs. Capcom 3 coming out later this year with additional fighters, you'd have to hope the Vita title might get the same treatment.
Amazon France lists Marvel vs. Capcom 3 for Vita [Gematsu via Eurogamer]