It's getting compared to Guild Wars, which makes me giddy just thinking about it. It's a classbased third-person shooter, F2P with option P2P (
http://forums.steampowered.com/forums/showthread.php?t=1077539 for specifics), with a single-shard, clan vs. clan, territories style system on P2P (that's AB, for other GW players) and an instanced co-op PvE mission system on F2P (GW missions). There are a few gameplay vids up on youtube, but it's still in beta currently, which you can preorder to get into, although it launches Feb. 1. Steam forums say the community is good and that the devs are cool people. Classes are Assault (heavy/soldier), Recon (sniper/spy), Robotics (engineer), and Medic. You can have 8 characters at any given time, with some customization and leveling up.
Minimum System Requirements
OS: Windows XP SP2, Windows Vista SP1 or Windows 7 (32 or 64 bit)
Processor: 2.4+ GHZ Single Core
RAM: 2 GB (XP), 3GB (Vista, Windows 7)
Video Card: 256mb video ram or better with Shader Model 3.0+ (GeForce 8 series or higher/Radeon HD3000 series or higher).
Hard Drive: 15 GB free space
High bandwidth internet connection (DSL, Cable)