All versions use a 400 horsepower 5.6L V8 engine mated to a 7-speed Automatic transmission with ASC, and Manual shift mode w/ downshift rev-matching.
They've also added quite a bit of safety equipment, accessories, and dress up bits (via carscoops.com):
These include the Forward Emergency Braking with Pedestrian Detection, which have been added on the Driver Assistance Package, and enhanced towing capacity, of up to 8,500 pounds (3,856 kg) when properly equipped, thanks to the Trailer Sway Control, added to all models. Moreover, it can also be specified with Wi-Fi, available in conjunction with the Theater Package.
The 20-inch aluminum wheels are also offered at no additional cost, along with self-leveling suspension, power liftgate, and LED headlights with integrated LED fog lights. Head for the range-topping model and you will have to pay an MSRP of $89,450, but this version adds 22-inch alloy wheels, dark chrome trim, stainless steel running board caps, under running board welcome light and tinted headlights and taillights inner lens. It can also be had in several exclusive exterior colors that join an extensive list of comfort, convenience, and driving aid features.