Looks like this rumor was debunked. The Blu-ray.com thread has been closed.
A rumor from Blu-ray.com
alludes that Sirius XM satellite radio might be exclusively working with Sony to bring the paid service to PSN. According to the insider -- who has allegedly seen business plans of the joint venture -- Sirius XM will be selling monthly, genre-specific subscription packs for $2.49 on the PlayStation Store.
There's only one problem with this whole set up: How is the PS3 going to receive the radio signal? Last we checked, the PS3 doesn't have a satellite receiver. Internet streaming via a firmware update, perhaps? For now, take this one with a grain of salt -- a Sirius
-ly large grain of salt.