For those of you looking forward to the PlayStation Vita, SCEA has confirmed which PSP games from the North American PlayStation Store will be compatible at launch. Among them is Maverick Hunter X, the only Mega Man related downloadable PSP release outside of Japan. That doesn't necessarily mean you won't be able to play other Mega Man PSP titles: The catch is that they're only available on the Japanese PS Store, where all of them are compatible with the PS Vita. SCEA has confirmed that they will be adding more games to the North American list of compatible games in the future, but that still requires the release of Mega Man: Powered Up on the store. That aside, take note that PSOne Classics and by extension PSOne Imports are not yet compatible with the PS Vita. That means you won't be able to play the four Rockman games currently available in North America.
Thanks for the tip, rockman!