According to the Major, there's an Enemy Territory: Quake Wars demo up on Live.
Blumph: "Experience the ultimate team – and mission-based online warfare, defined by the acclaimed Wolfenstein: Enemy Territory, now set in the legendary QUAKE universe. Choose to play as the human Global Defense Force or the invading alien menace, the Strogg. Each side has distinct classes, vehicles, and weapons to choose from, giving players countless ways to join the battle."
Get it if you're not too hot.