Nah they can't have a bigger card... I mean, what would it be? I bet they have a lot of big stuff to show and they wanted to get out of the way the reveal of Part II and start to work hard on the game.
I think is safe to asume that E3 will feature: God of War, Days Gone, Spiderman, Detroit, Dreams, Uncharted Lost Legacy, GT Sports, maybe Sucker Punch game? and all the third party, VR, and indie games. It's already packed.
E3 presser closes with '5' flashed for 1 second.