It's free, and it's fun as hell. It's finally out of beta, so download now and play!
It's an FPS with a focus on speed. Seriously really fun gameplay.
Here's some footage
12/07 - Exodus
12/08 - Blackalicious
12/11 - Saves The Day
12/16 - Pallbearer
12/18 - Orange Goblin OR Wolvhammer