Criterion has detailed what Kinect support will be on offer in Need for Speed Most Wanted.

The principle of the support is that you will be able to upgrade and mod your car on the fly without any need to pause the game.

Criterion explains:

“For example, while you’re in your SVT Raptor, you can say ‘Mods, Nitrous, Burn Nitrous’ and your car will instantly be equipped with an extra boost that you need.”

“Need some slicks for the asphalt? Easy: ‘Mods, Tires, Slicks’ and off you go.”

[Source]