Okay, so amassing all the rumored games which have links to possibly being Xenon games....
-Perfect Dark Zero (MGS/Rare)
-Killer Instict 3 (MGS/Rare)
-Halo 3 (MGS/Bungie)
-True Fantasy Live Online (MGS/Level 5)
-Vanguard: Saga of Heroes (MGS/Sigil)
-BLiNX 3 (MGS/Artoon)
-EA Sports 2006 lineup (EA)
-Fallen Angels (EA/DICE)
-New Castlevania (Konami/KCET)
-Phantasy Star Universe (Sega/Sonic Team)
-Virtua Fighter 5 (Sega/Sega AM2)
-Ninja Gaiden 2 (Tecmo/Team Ninja)
-Dead or Alive 4 (Tecmo/Team Ninja)
-Soul Calibur 3 (Namco)
-Moto GP: URT3 (THQ/Climax)
-Tom Clancy's Splinter Cell 3 (UbiSoft)
-New Grand Theft Auto (Rockstar/Rockstar North)
-New Tony Hawk (Activision/Neversoft)
-Dark Sector (Digital Extremes)
-Nintendo stuff (heh!)
-Square Enix stuff (double heh!)
..what else?
-Perfect Dark Zero (MGS/Rare)
-Killer Instict 3 (MGS/Rare)
-Halo 3 (MGS/Bungie)
-True Fantasy Live Online (MGS/Level 5)
-Vanguard: Saga of Heroes (MGS/Sigil)
-BLiNX 3 (MGS/Artoon)
-EA Sports 2006 lineup (EA)
-Fallen Angels (EA/DICE)
-New Castlevania (Konami/KCET)
-Phantasy Star Universe (Sega/Sonic Team)
-Virtua Fighter 5 (Sega/Sega AM2)
-Ninja Gaiden 2 (Tecmo/Team Ninja)
-Dead or Alive 4 (Tecmo/Team Ninja)
-Soul Calibur 3 (Namco)
-Moto GP: URT3 (THQ/Climax)
-Tom Clancy's Splinter Cell 3 (UbiSoft)
-New Grand Theft Auto (Rockstar/Rockstar North)
-New Tony Hawk (Activision/Neversoft)
-Dark Sector (Digital Extremes)
-Nintendo stuff (heh!)
-Square Enix stuff (double heh!)
..what else?