2K Games’ E3 2005 product lineup:
Prey: Developed by Human Head Studios and produced by 3D Realms, Prey is a revolutionary first person shooter for PC and the Xbox 360. Prey is being exclusively showcased by ATI in a movie theater-style exhibition in booth #600 in the South Hall.
Sid Meier’s Civilization IV: The fourth game in the PC strategy series that has sold over five million copies, Sid Meier’s Civilization IV is a bold step forward for the franchise, with spectacular new 3D graphics and all-new single and multiplayer content.
Sid Meier’s Pirates!: In Sid Meier’s Pirates! for Xbox, players take the leading role of a Pirate Captain in the 17th century Caribbean
Sounds like Elder Scrolls IV: Oblivion will be on the Xbox 360 since they mention “next-generation console system”. Although they don't say which system, their last one was a hit on the first Xbox, so I am sure they will stay with that platform.