I don't want to be the guy to rain on your parade, but E3 is a tech demo. The trailers you see at E3 are usually tech demos that are so far from the end product that you might get a completely different game upon release. Remember Watch Dogs? And this is Ubisoft, the company that said it is developing these games on PC (which every company does) but I bet they are making them for consoles first.
I have not watched the trailer as I don't watch E3 trailers. I only watch launch trailers. I don't want you guys getting your hopes up and then being disappointed though.