Now I wish I'd preordered it since I woulda been included in the Beta. Oh well. If anyone's around at 2 PM and interested you might be able to get a slot. Looks fun.
Here's what IGN says:
If you've got the rig to run it and are at all into team-based first-person shooters, you should definitely make the effort to download the beta and give this one a try. Along with helping the guys at Splash Damage and id fix any bugs or balance issues, you'll get a great look at what you can expect from the final product. Remember to check out Fileplanet tomorrow around 2pm for your chance to get in!