If you pay attention, people in the first trailer fall down at the same speed as they do in the second trailer. The ground combat also moves at the same speed. Nobody complained about the speed in the original trailer, and I believe that the reason why it seemed slow in the second trailer was because they wanted to show each character's moves in more detail, and they couldn't do that if the trailer went too fast. And of course, it will play much faster once professionals learn it. In conclusion, I don't think that we need to worry about the speed of this game.