As I am sure you know already, MY2010 and 11 navigation data is on a hard drive and may only be updated by a dealer with a special upload tool, so I'd check with them to see if there is a MY2012 map update for your specific VIN. I wouldn't hold my breath for new features to be added though, usually map updates are just what they sound like, they don't add any functionality to the system other than the latest database of streets and POIs.
