As the slow dribble of behind-closed-doors E3 videos begin - rendering that whole "behind-closed-doors" bit a little farcical as it does every year - I suggest saving them all up and watching them all in three days, ideally in rooms about half a mile apart, with five minutes to get back and forth between them. Have those rooms be un-airconditioned, sealed off heat traps with the volume three times louder than the human ear can stand. Capture the experience. One very worthy addition to your schedule is Carrier Command's 11 minute presentation, giving you an in-depth idea of how it will play. It's below.
The camera does eventually stop spinning around a boat.
You can of course get involved yourself via the pre-order beta, which is all done here.