Of further details of the beta we can tell you that it wil be:

Map Name: Port Valdez
Players: 32
Game Mode: Rush
Environment: Snow
Theme: Vehicle and Infantry
Back Story:
The battle for Port Valdez is fought alongside the waterline towards a great oil industrial landscape in the Alaskan mountains. Using basically everything they've got the Russian forces are launching an airborne assault to knock out the oil industries in the area. In their arsenal there are Main Battle Tanks as well as fast-moving Quad Bikes and mobile armored AA. It's a vehicle focused battle, but with plenty of infantry combat.