I think I counted about 9 or 10 different character models throughout that trailer. (I paused it every few seconds to check). Which is certainly a good thing, adds more diversity to what you're shooting.
That lightning gun the huge helghast fired looks amazing. After hearing early reports of weather being implemented into the game -and then the subsequent unveiling of lighting artillary guns in the first trailer- I always had a feeling a lighting gun might pop up. It's truly a great idea and I just hope you get to pick one up and actually use it.
I also have to mention that the helghast with the cloak, 3 red lights and a cloth around his face shown in the screenshots posted by MM a few posts up is my favourite, I'd imagine he's the sniper class.
