Gamers are a fickle bunch, I'm sure you know. Nobody is going to forget what MS did last E3 (and how Sony countered them), regardless of how much they want to change that perception. Most of us get that both companies are trying to make money however they can, but Sony did it in a much more reasonable manner. It was the same way with Sony and the PS3 launch and the first few years after that.
Assuming the game comes out late 2015, it's not too surprising if they don't want to show anything too detailed, given it's their first PS4 title. I still wanna know what resolution and FPS they're aiming for though.