Here are some of the things on the next generation GS. These are US specs so the power and options may be better than we will get in the UK
4.3 V8 (300hp - no change), new 3.0 (3.3?) V6 (245hp)
6-speed gearbox from the LS
4-wheel drive option
keyless entry/starting
4 setting adaptive suspension
optional climate control seats
Vehicle Dynamic Management (VDM) - latest traction control system to replace VSC
Tyre pressure monitoring system
Adaptive Front lighting System
Rear parking camera
optional Pre-Collision System (PCS) to detect impact and start to brake before hitting object
Knee air bags
Variable force front airbags
Basically the same length as the old model but with 2" extra wheelbase and just under an inch wider.