I don't see what people are getting so excited about. Capcom already announced that there would be a RE5, so that's no surprise, and that trailer is pre-rendered footage, giving us no idea as to the in-game graphics or gameplay. Plus I really don't like the look of that guy in the trailers (who I bet is the protagonist). He's pretty ugly/bland looking.
That being said, I bet it will be a cool game, but those promos do nothing for me.