I have no idea if this will work on HCH II, but if it does, it could be worth waiting for.
http://blogs.ocregister.com/gadgetress/
6/1/2006
XM Satellite Radio
A handful of new portable devices can be tested at
XM Radio's exhibit.

Coming out later this summer, an easy way to tune into XM. Rather than the bulky tuners, XM will sell a "tuner chip" about the size of a CompactFlash card for $30. This will give any of your XM-ready products - a car stereo, home stereo system, standalone XM box - the XM service. You'll also need the home kit, which is a docking station and cord to plug into the audio product. That will cost another $30 or $40. Expect this later this summer.