I can't remember where I read this, but I thought the factory option was going to flip up from the center console, so that it was only visible to the rear seats. It will NOT be integrated with your NAV display, no way a factory option is going to allow that. (I'm sure someone will discover an aftermarket hack to get this functioning). Because it's a factory option, I'm sure you will have the choice of using the stereo speakers or headphones.

CAMRHEE Hybrid
Completed Mods: RK-Sport body kit, 18" LexusGS430 wheels 235/50ZR18 tires, TRD/SE springs, Rear Lip Spoiler, Terk XM-Direct, Smoked tail lights, Sliding Armrest, Rear Bumper Applique, Front License Bracket, Lower Grill chrome inserts, K&N, Blaupunkt THB200A sub, moved rear HSD emblem
Future Mods: fog lights, black chrome my wheels

http://www.greenhybrid.com/share/fil...fterFront4.JPG