Greg Stone, a designer at Nerve Software working on the Xbox360 conversion, has said the companies are working to bring demos of the game. It's not known whether they'll see release before or after the console launch of Quake Wars.
Activision Underground is handling the PC-to-PS3 port of the game; both versions will include the PC features but also significantly refine the interface.
Enemy Territory: Quake Wars is a team-based multiplayer FPS, it'll undoubtedly fit well on the next-gen consoles. The maps include objectives to complete and the game doesn't have to be played online. You can just as easily square off against the computer or use AI enemies for target practice before unleashing your abundance/lack of skills to online foes.
Both console versions should be arriving this year.