My car has an ICE iPod hookup allowing me to play music through the speakers and keep the 1st gen iPod recharged. My understanding is that newer iPods/iPhones/iPads have different power requirements. For example, my iPad2 won't charge in my car.
Only the iPad(s) require more juice for charging. All iPods and iPhones
should charge just fine with an older iPod car charger. In fact, these new nanos have very low power requirements. My laptop USB port charges my nano 6G is about an hour.
Does anyone know if the new iPods work with legacy connectors?
Will I lose car stereo capability with nano upgrade?
This one is trickier to answer. I guess the right answer would be "it depends". What make/model is your car's head unit. That would be the first place to start looking.
As far as the ability to connect physically, the nano 6G still uses the same 30-pin iPod connector as the nano 1G. So it'll fit. Will it work is another question.
ft