One more thing to note that's been getting overlooked:
There was no official update to add these commercials. I have the game and the expansion, but I have no ads because I haven't been online since I bought it. But my friend across town told me about the ads, and I said "great, I just won't get the update", and he tells me there wasn't one. He never agreed to a download of any type. This isn't part of the Fury update, nor is it part of a version update download. It's a complete stealth update that occurs without your permission.
I'm curious whether you even have to run the game to get "infected", or if just having your PS3 online will prompt the stealth install. I'll find out on Thursday when I buy some new Rock Band songs.