Hugo did leak details about the canned Mark 3 a bit ago, and thats probably what went to the OEM design phase.

It was basicially a car version of the HSX player. It wasn't removable, but had a removable drive. The unit also had a USB host like the HSX player, for ethernet or wireless...

I'm sure the empeg will show up in cars down the road. Now if only we knew what else they were working on, considering they didn't do the portable HD player that is going to be announced at CES.