I found this kind of surprising - Top Gear reviewed the Hummer and loved it. Hopefully the TV version will film it in some crazy challenge!
It's just UI skins, you can do this now with your computer. GM told us about this with the Ultifi platformOne small tidbit I noticed myself was the fact that you will soon will be able to download your own artwork for some of the icons. Not sure how that’s going to work, but sounds like just another way to customize your Hummer.