For those out of the loop, here is a short description of it by the developers:
Warsow is a fast paced, deathmatch game. It has your classic things like bunny hopping, rocket jumping, and general mayhem. There's many game modes, including, Bomb & Defuse, CTF, Instagib, and the classic 1v1 Duel.You can see the full changelog (including many nice screenshots) here, and if you want to give it a try, head over to their download page.
They also made a nice release trailer:
For those wondering, there is some discussion here with War§ow developers trying to justify their decision to keep the art assets non-free and why there isn't a open source-code repository.
Personally I am not convinced, but at least they release their engine code and promise to keep the overall game always freeware...
However besides that, it's a fun FPS! So try some crazy parcour-like moves yourself ;)