I bit the bullet and bought premium today.
Only played 2 maps, Operation 925 & Donya fortress. The latter level isn't that great IMO (only played TDM on both)
Going to have some dinner then have a blast on the other levels, and the new game mode, 'Gun Master' where you start with one gun, kill twice with it and then the gun changes. Should be OK.
Didn't notice much with extras though, bit of cammo for the guns and a couple of new cammo's for the soldiers. More to unlock through assignments though, some look pretty easy, some not so much...