Analyze The Environment
ZombiU aims to eliminate the pain of checking every enemy and crate for loot by allowing you to scan the environment ahead of time with the Wii U tablet. Pressing a button and holding it up to the screen turns on what's essentially X-ray vision.
It's not actually faster than just checking each container manually, since you still have to scan each and every one individually. But the Ubisoft rep walking me through the demo pointed out that the ability can come in extremely handy when there's a zombie or two (or more) between you and the nearest ammo crate.