Microsoft has released video of numerous games, including Star Wars Republic Commando. All that is known currently is that it is an XBox title; however, at publication time, I was unable to watch the video or collaborate this with any other source due to time constraints.

UPDATE: IGN has posted the full video preview of Republic Commando, and we can now tell you that it's a squad based shooter, possibly set around the Clone Wars:
In 2004, LucasArts plans to release a new Star Wars game exclusively for Xbox and Xbox Live. The trailer for Star Wars: Republic Commando almost seems like it's fromt a different universe at first. A mixture of squad-based combat and survival horror, the game does not occur during the original trilogy's timeline, that much is certain. The trailer shows a couple of Republican guards chasing after a three-foot tall wall-crawling nasty. When they finally corner him, they see to their horror the entire room is filled with their buggers. Visually, the cut-scene is marvelous, but who knows what in-game visuals will look like. It definitely got the crowd roaring early.
We'll have more on this soon, and keep a look out on the LucasArts website for the official announcment.
Das Video gibt es hier