Update: We have ran across some scans of said game.

Project X Zone will be fully revealed in next month’s issue of Famitsu magazine. Here are a few details we know about so far:

Project X Zone is a strategy RPG featuring characters from the three makers: Capcom, Sega, and Namco Bandai. The characters team up for fighting sequences. Below is the list of characters we know so far. A trailer for the game will be shown off later this month.

 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)

Link