First thing i'll do is set up a skirmish if thats possible still(Rather get right in the action I want if I can vs. campaign) Play a combined arms map on firefight. Take the driver slot of a tank and try to drive right through a house filled with Russians. I can't imagine they left bot skirmish out considering AI was pretty bad in RO 1, and they still left the ability to play alot of maps in skirmish bot match mode.
Then try out the machine gun and sniper rifle iron sights. Also probably alot of practicing the cover system. Apperently its simpler then it seems but it'll be learning none the less. Then straight to multiplayer after I try the tank thing, fire alot of rounds into a group of enemies with the MG, and get a stomache shot with the sniper to see this writhing pain animation. And probably try a neck shot near a wall to see if I get arterial spray
Edit: ^ And to the guy two posts above, I believe one of the developers said that the beta would be all inclusive(Multi and single). But someone could correct me on that.