Clearly everything really is permitted, because an anonymous tipster provided the above image to Joystiq a few hours ago. That photograph is supposedly from a beta version of upcoming Soulcalibur V, which was demoed at a fighting tournament. And hey look, it’s Ezio!
Franchise cross-overs are nothing new to the Soulcalibur series; the previous iteration featured Yoda, Darth Vader and Starkiller all making appearances. If this photo is legit (and there’s been no denial or confirmation from Namco Bandai as yet) then Assassin’s Creed 2 (and Brotherhood AND Revelations!) star Ezio Auditore de Firenze will be making an appearance.
It’s an interesting choice of cameo, if this is real. Ezio certainly lends himself to a fighting game, and all of the characters in the Soulcalibur series use weapons, which Ezio has no shortage of in his games either. See, jaded gamers? The industry can still surprise us.