In case you haven't seen the trailer yet, here it is: http://community.us.playstation.com/t5/The-Last-of
It's looking like most kills are done (on average, at a guess) in two shots. Some people who saw that Spanish video recently complained that the enemies were taking too many bullets.
Well, the guy was mostly hitting the legs and arms, so I guess that sort-of-confirms separate hitboxes?
Not an official confirmation or anything, just some educated speculation.
Anyone got any thoughts on that?