According to Event Hubs, Capcom producer Yoshinori Ono recently dropped a fairly sizable bomb on attendees of the company's "Street Fighter Mania!: SSFIV and Beyond" panel at Comic-Con: Street Fighter X Tekken. The oft-rumored project will be developed by Capcom using the Street Fighter IV engine (only with two-fighter tag team battles), and will feature a number of fighters from Namco's similarly successful fighting franchise, including Kazuya and Nina Williams.
But that's not all! Ono also revealed that Namco Bandai would be developing Tekken X Street Fighter, which will be developed in-house at Tekken, and spearheaded by long-time franchise producer Katsuhiro Harada. Both titles will be released for 360 and PS3, though according to a cheeky slide at the end of the presentation, the current release window is "not for a while!" Update: Now with video!