Here’s an official confirmation of what Capcom’s official site leaked earlier. Joe the Condor and Zero are two challengers in Tatsunoko vs. Capcom: Ultimate All-Stars. Instead of using Zero as he appears in Mega Man Zero and SNK vs. Capcom Chaos, Capcom chose classic Zero from Mega Man X.
IGN says these are the final two characters, but that would tilt the game in favor of Capcom since Hakushon Daimao is out. Yatterman No. 2 is supposedly the last the character for Capcom to reveal.
While we’re waiting to see her in the game, check out videos of Joe and Zero on IGN.