There are a lot of changes, about as many as came in the 2008 model year. Highlights include:
1. New grill
2. New COMAND system (with hard disk, similar to what's in new SL-class)
3. G500 gets new 5.4L V8, will be called G550 in the US
4. G55 engine tweaked to 507HP
5. G500 gets new rims, same size
6. G55 gets new 19" rims
7. G55 gets new Alcantara headliner standard, option on G500
8. Improved mobile phone interface, bluetooth, and MP3/iPod support.
9. TV tuner now supports DVB-H broadcasts in Europe
10. Harman/Kardon sound system upgraded to Logic7 with number of speakers increased from 10 to 12, power up to 450 watts, DD/DTS 5.1 surround support added, and speed sensitive volume.
11. Ventilated front seats now an option (badly needed in warm countries)
12. Slightly different hood badge
13. New designo leather front seats
14. Tire pressure monitoring now available on SWB and Cabriolet