This was definitely the most impressive game of the show, but rewatching it there is so much that just doesnt seem right. There were way too many custom situational animations for a real game. The bar scene looked so real because people were turned or sitting in a very natural way that you would see in a bar. But no animation engine would know how to do that, it would have to be done by hand. So much custom dialog from people in the streets and bar. The cars crashing just happened too perfectly as well. Is it possible his car could miss other cars in the collision? Probably scripted and maybe if you dont trigger the lights it's mission failed, or maybe you have to go to an alternate spot on the other side of the club to kill him.
But how much of a city could they have all of these custom situations, dialog, and animations for? It's not a matter of if the hardware can handle it, it's a matter of how many man hours it takes to put all of this stuff in. Taking everything together into consideration there is a lot about this gameplay trailer that doesn't feel right.