Yes, there's a lot of stuff about MGS4. There's the comedy-based MGS4 trailer that has Snake and Raiden clamoring for the "lead character" spot from E3 05, the TGS 05 comedy trailer where Raiden goes back in time to become the only MGS star (he tries to kill Big Boss, so that the MGS3 hero will be dead, and the MGS1 hero will never be born, so he'll be the only remaining MGS hero) and the big, awesome, high-res, real-time, non-pre-rendered MGS4 trailer with the Old Snake. Not to mention a whole bunch of camera time for Kojima, who in all likelihood talks about MGS4.
And also, six days left.