Some die hard XM and SIRIUS fans and stockholders have gone through the trouble and hassle of the slow FCC website looking for clues of new radios and hardware. Anything with an FM Transmitter will need to be certified by the FCC. Some have spent hours and hours searching for recently approved equipment.
http://satelliteradiotechworld.blogspot.com now has that covered, at least for now.
It gives some insight onto things that haven't been announced and the general move towards innovations that SIRIUS and XM have not gone public with quite yet.