I remember reading a few months ago (when the new video of Duke lifting weights was released) that they are all for a Linux version. At this point, the franchise may actually benefit of having clients on as many platforms as they can, IMO. If you have any contacts, it may be worth a try sugar-talking them to do a Linux version (I'd LOVE if they'd be willing to give us a headstart and release the Demo on Linux first than any other platform, that'd be me dreaming [again])
No announcement yet.
LinuxGames has a QuakeCon recap...