A clever Shoryuken.com forum user has done some snooping around Capcom's site for Tatsunoko vs. Capcom and uncovered evidence suggesting that Mega Man's Zero and Dead Rising's Frank West will be playable.
Shoryuken poster mumu poked around the Japanese site for Tatsunoko vs. Capcom and uncovered some rather intriguing evidence hidden within the site's source code. While most of the character buttons featured already-unveiled members of the cast, these five were unexplained:
On the Tatsunoko side of things, that's likely Yatterman's Yatterman #2, Gatchaman's Joe Asakura, and Tekkaman Blade's ... uh, Tekkaman Blade. As for Capcom, these seem to point to Mega Man X's antihero reploid Zero - not all that surprising, given his popularity - but perhaps more interestingly, Dead Rising's photographer-cum-zombie-slayer extraordinare Frank West. He has covered wars, you know.
Frank West and Zero are certainly cool additions to the game, but alas, we remain Phoenix-Wright-less, which makes us cry inside.