I like your logic, hope it's true.
They could quite reasonably dedicate 15 mins to GoW 3 remastered, but it wouldn't be the best usage of stage time from a PR perspective.
E3 was traditionally a trade show for the industry and press, nowadays it's very popular with end consumer so it's kinda hard to really nail the tone/type of show content for those giving the conferences.
PS, PS2, Gameboy Advance, PS3, PSP, PS4, Xbox One