I just google-fu'd a copy of the Battlefield 4 Xbox One manual!
WHAT CAN I SAY
If you are a Squad Leader, and there is a Commander, you can also say Request Order when your squad is readyfor duty. Let your Commander know what you need by saying Request Scan, Request Vehicle, or RequestSupply. When you are in the Deploy screen you can deploy by saying Spawn. During gameplay you can plan what classyou should deploy as, next time you deploy, by saying Next time spawn as Medic or whatever class you choose.The next time you deploy you will be deployed according to your wishes.The full list of Voice Commands can be found under OPTIONS > KINECT
LEANING
Using the Kinect, you can lean to look out from behind cover. Use this as a tactic to keep yourself partially behindcover while at the same time being able to shoot at an enemy. You can lean while standing or crouching.To turn Leaning ON/OFF, toggle the setting under OPTIONS > KINECT > LEANING ENABLED.
HEAD TRACKING
The Kinect can track your head. When in a vehicle, you can turn your head to look around. This will allow you tokeep driving in one direction but still get a good look at your surroundings.To turn Head Tracking ON/OFF, toggle the setting under OPTIONS > KINECT > HEADTRACKING ENABLED.
Cached version of the manual is here -
http://webcache.googleusercontent.c.../en/b4-xbone-en.pdf+&cd=1&hl=en&ct=clnk&gl=us