Doesn't take a genius to work out.....if you look at the job pages, they've hired a large amount of people in the last three months, the e3 was a demo, to get cash and hype for the game they make after....same with watch dogs, same with far cry 2 and assassins creed 1.
This kind of thing happens all the time (I think). I can't help but think of Aliens:Colonial Marines since that was when I really noticed people getting angry over it. This video shows some quick comparisons of the demo footage versus the final footage, if I recall correctly the demo was even built on a different engine…