Here's a gow3 beta stream, pretty interesting.
http://www.justin.tv/prod1gyx#/w/1085209360/7
I've only been watching it for a little, but from what I've seen:
-Shotgun may be alittle weaker, still not sure
-Hammerburst has 200 bullets on start, seems like reload is a little slower also
-Smoke grenades don't ragdoll, but they do stun your upper torso, you're unable to aim or shoot, but you can move.
-Ink grenades cause a full body stun ( I think, i've only seen one ink so far)
-Retro lancer's charge isn't always a 1hitkill, I just saw it wound. Idk what causes it though.
-Boom shot has 3 shots again
I'll edit if I see something else :D