One particular mechanic the game doesn’t communicate is the ability to slide.
This is definitely a new addition to the series, and it allows you to use your momentum to get into cover, or around a corner, quickly. All you need to do is hit the crouch button after you’ve been running for a bit to perform it.
The distance you slide is very short, but is usually just enough to get you out of trouble. You can also aim your gun at a different angle than the one you’re sliding towards mid-slide.
One other community-discovered quirk that’s perhaps a little less intended than the slide, is the ability to boost teammates over high walls. Basically, one player has to crouch near a wall and the other needs to try and jump over him. While doing that, the crouched player can stand up to boost his teammate up.
It looks like an unintended side effect of the new vault animations, but we’ll take it.