This new interview found by hero member illuminator reveals some new information, mainly that of multiplayer. One of my personal bugbears was the ranking system but it wont be to the extent of unlockables which should be fine for now:

° There is an Online Ranking system (highest rank: Brigade general), you dont get new features, you just see, how long did you play and some information about your skill.
° No clan features (like a Squad logo) at release, maybe after relase via DLC.
° Grenade explosion can divulse arms (hm, didn’t see that in my preview code).
° There is a 3rd view spectator view within the MP mode (switch every 3 seconds from one soldiert to the next).
° No custom skins or uniforms at release, maybe later after release via DLC.
° After disconnect in MP, the free slot will be filled out by AI. Then you have to wait until the mission end to rejoin.
° SpecOps AI has a better moral, so it’s harder to beat them.
° You have to install some local files to play on PS3.

Discussion

Preview/Interview