A trawl through Amazon just showed up some PS Vita artwork for Need For Speed Most Wanted. Pretty much the first solid proof of the Vita version's existence. Threre's some of the neat renders along with it on the page, but no Vita specific shots.
Buried in the text though, is this nugget. "Vita Exclusive Features - Navigate and play Vita specific events and challenges with fully enabled front and rear Touch Pads. Use the Front Camera to take your Autolog profile picture or the built in Microphone to chat with friends online."
You can pre-order the game at £34.99 or for £37.99 on PS3 here: