The main protagonist Joel is said to have his own hit detection, and if he gets shot in the left arm you would see him hold his injured arm with his right hand. It will also lead to blood loss and the screen would turn red.
To fix it, you need to remove the bullet out of the wound, disinfect it with alcohol or antiseptic and bind the wound.
The game behaves dynamically and if you are injured after getting shot, you cant use the shotgun immediately with perfect precision, the cross hair will be unstable. There are no health kits around but you can use toilet paper and rubber band to bind the wound.
Theres no blindfire in the game. As revealed earlier, the bullets are rare and you have to make your shots count. If you press the R1 button without aiming, it will open up the crafting menu.
You only punch with your fists in close combat if you dont have a close combat weapon such as a brick equipped or in your bag. If you press the punch button he will automatically get the close combat weapon out of his bag or back and punch with it.
The listen mode can be disabled and if you use headphones you can hear every sound the infected are doing. The sound design seems to be really fantastic. Listen mode enables you to see through walls and its nice that it can be disabled.
Information is confirmed to be fake: https://twitter.com/Neil_Druckmann/status/311873472877969408