Yesterday I finally got an e-mail inviting me for closed beta access.
I gave it a shot. Not bad, everything runs smooth. Textures are changed on maps. They have better lighting and looks metallic. Some things are dumbed down graphically but it still looks fine. When you look around it gives you the visor affect and kind of distorts things not in the middle of your screen. The gun models are a bit smaller too.
Apparently they had the beta going for a while but I guess it was whoever registered first thing. They claim to have sent out beta invites to everyone so I'll check and see if I can get you guys online