Battlefield 4 is already being shown off to partners of publisher EA.
We know this because GameStop CEP Paul Raines said the following yesterday via his chain's Twitter account:
Got to see Battlefield 4 today and all I can say is WOW! Thanks @EA for the sneak peek. Can't wait for you all to see it. #BF4”
VG247 notes that the message was retweeted by EA's own official account.
THAT'S BECAUSE IT WILL BE SHOWN OFF AT THE PS4 REVEAL TONIGHT, RIGHT?
Sorry. We're having trouble getting the PS4 reveal out of our minds. Did we mention that it's happening tonight?