There were plenty of rumours earlier which indicated that the next God of War game will feature multiplayer. I think it was better that they revealed it before E3, but I don't understand why they said the SP is shorter.
I mean, I appreciate their honesty, but for a God of War game I think many people would be turned off by that. I really hope they do a better job on the SP than God of War 3 even though it's supposed to be short; more variety and stuff. Otherwise I'm gonna blame the MP component for ruining the game.
He didnt compare it to GOW3 just the trilogy in general. So the game could be anywhere between 8-12 hours long. Honestly as long as its varied and exciting I don't care if its short. Just give me more adventure.