No real game footage in thsis video, but man is the CG awsome:
http://media.xbox360.gamespy.com/media/857/857436/vids_1.html (http://media.xbox360.gamespy.com/media/857/857436/vids_1.html)
A rebirth of that Total Conversion for C&C Generals is the rumor. Shut down by Microsoft then hired to work on it as a legitimate title.
As I remember Halo was originally susposed to be an RTS. But FPS was easier to do on a console, and bungie wanted to have the launch title for the XBox so Halo was born a FPS first.