The 2011 300C will have front/rear park assist, I believe that it is the first domestic Chrysler vehicle to get the front assist.
The Grand Cherokee will probably add the feature for the 2012 model year, as stated it has been on export models for several years. There are quite a few differences in export models, and the list varies from couuntry to country. Some of the features are required by law.
I would have to research the differences for the WK2, but to give an idea of some of the differences on prior models, here's the list from the 2005 WH:
Alternator, 180 Amp
Antenna, rear side window integrated
Battery, 800 Amp
Diesel engine
Emergency Kit Group (fire extinguisher, first aid kit, reflecting triangle, tool kit)
European Equipment Group (front license plate bracket, headlamp level system, 140 mph speedometer, 3500 kg. tow group)
Fog lamps, rear
Fuel filler cap, locking
Headlamp leveling system
Lamps, side marker
Lug nuts, locking
Mirrors, power folding multi-function
Paint, exterior colors: Graphite Metallic Clear Coat and Patriot Blue Pearl Coat
Security system, Premium (Mopar accessory on the WK)
Thatcham Security Equipment