Saw it live during the press conference. I wasn´t really impressed by the coop mode. Animations and everything look nice, but infantry combat looks far from "revolutionary" and "immersive". Weapon handling looks not really different from CoD, either and I can´t really see why Andy McNab was casted as a "weapon expert". The guns don´t really have realistic behaviour and can I see auto-heal and orange doritos? Meh...Oh, and why did they show the coop mode on the PS3? Ego-shooters on consoles are just crap and you could clearly see that they had problems aiming properly with a console controller...
The Caspian Border trailer looked good, too. It achieves the feeling of fighting on a "real" battlefield instead of walking through one long "hose", but you can´t really see the actual map size, so I´m eagerly waiting for a mini-map. Finally we could see jets in action and that little EOD robot was kinda funny, too.
But so far I still can´t see why BF3 will be the FPS of the year and unless I´ll see reasons that´ll convince me otherwise I won´t preorder it.
EDIT:
Here´s the minimap. Not as big as I hoped :/