Holy shit, this game is already amazing.
If you like "arcade" shooters where movement matters just as much as aim (quake, UT) or ever enjoyed any tribes games, you have to try this. Its a bit different as far as weapons go (its all class-based), but once you get used to it, the system seems solid.
Its in closed beta right now, but I signed up to get a key and had one in my email 8 hours later, so I don't think it'd be a problem for anyone to get keys.
Seriously; it's fucking amazing.
https://account.hirezstudios.com/tribesascend/