That is definitely General Hux. Nice to see redheads aren't extinct in the Star Wars universe. :-) Anyway, in the newest shot we see all the troopers facing him, but in the second teaser, they quickly turn around. I wondering why they turn around. Are they going to march to war or are they turning to look at something?
Also, I'm not sure if this has been pointed out already, but one of these shots in the second teaser has been flipped. You'll notice the scar on Ridley's cheek switches sides. For what it's worth...