The good news for us? Mega Man X and Zero are in the game. According to the magazine, characters will team up in pairs for fight scenes. Naturally, X and Zero act as each other's partners. UPDATE: A scan of the dynamic duo in action has been revealed. The pair are shown duking it out with a Met in an area that strongly resembles Cyber Peacock's stage. Incidentally, the bottom right screen shows X and Zero performing attacks from X4 -- Twin Slasher and Raijingeki respectively.
The two Maverick Hunters will be joined by the following pairings:
Ryu & Ken (Street Fighter Zero), X and Zero (Mega Man), Demitri and Dante (Darkstalkers and Devil May Cry), Chris and Jill (Resident Evil)
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)
Sanger Somvold (Super Robot Wars), Jin and Ling Xiaoyu (Tekken), Kos-Mos and T-elos (Xenosaga), Yuri and Estelle (Tales of Vesperia), Kite and Black Rose (.hack)
Famitsu also notes a trailer for PXZ will debut later this month. Exciting stuff. Stay tuned!
Source: Andriasang (thanks, Jimb0!)