Starting August 13, 2014, Sirius XM will have to pay royalties to foreign sound recording rights holders (mostly U.S.) under the terms of a new World Intellectual Property Organization Copyright Treaty. XSR plans to increase the Music Royalty and Regulatory Fee (MRF) that it passes on to subscribers to $2.27 per month, from about $1.00 currently. However, it could take over a year for this increased fee to flow through as subscribers gradually renew their contracts (with many on annual subscriptions).
Not sure if they have raised their prices yet, but, if not, it would be wise to lock into a longer term contract if you have any interest in satellite radio.
Be sure to read the fine print, as I know that the Lifetime contract is only for as long as you own the vehicle. Not sure how they know when you sell your vehicle, but that is what the fine print says.