Man, we should be able to plug our empegs into that thing (like a docking station) and to auto-magic syncups.

If you're referring to the HSX-109, yes, that is the plan. Right now it will only squirt tunes into Rio portable players, but it is planned that a future release of the software will allow it to synch with the Rio Car as well.

/me wonders if we can use the ethernet or USB connection to do that...

It will be USB. The HSX-109 has a few USB ports and an HPNA port, but no ethernet port.

It will connect to an ethernet network via a $30.00 USB-to-ethernet adapter box, but I don't think direct synching with the Rio Car would use that interface. Then again, maybe it might, I dunno. The feature hasn't been written yet, we'll have to see.