The mysterious collaboration between Sega, Namco Bandai and Capcom has been revealed on the pages of Famitsu this week. As many speculated based off recent trademark filings, the 3DS game is titled Project X Zone (pronounced Project Cross Zone).

Project X Zone is a strategy RPG featuring characters from the three makers. According to Sinobi, which gets Famitsu in advance, the characters, in general, team up in pairs for fighting scenes.

Characters are listed here in their pairings:
Capcom
Ryu & Ken (Street Fighter 0), X and Zero (Mega Man), Demitri and Dante (Darkstalkers and Devil May Cry), Chris and Jill (Resident Evil)
Sega
Shinguji Sakura and Ogami Ichiro (Sakura Wars), Pai and Akira (Virtua Fighter), Kurt and Riela (Valkyria Chronicles), Ulala and Touma (Space Channel 5 and Shining Force EXA)
Namco Bandai
Sanger Somvold (Super Robot Wars), Jin and Ling Xiaoyu (Tekken), Kos-Mos and T-elos (Xenosaga), Yurie and Estel (Tales of Vesperia), Kaito and Black Rose (.hack)

A first trailer for the game will be shown later this month.

http://andriasang.com/con0lk/project_cross_zone_details/