The fact that that pistol shoots sticky grenades is a bit disappointing, although it sounds like it could lead to even more hilarious hijinks. Hopefully there's a traditional bouncing pro pipe as well?
Seeing things. I just watched it in slow mo from start to finish and didn't see a Brute.
Did see a couple diving executions which looked cool. Also noticed that the damage indicator in campaign / spartan ops seems different than the damage indicator in "War Games". In one there's an arrow, in the other there's the orange hex grid.
Also, I'm sure people noticed in the previous videos released that there's a grenade indicator in the HUD to show when there's a grenade about the explode near you.