Got my 2009 rocket classic today just under 2000 miles. Brilliant bike. I have noticed a scraping sound at low speeds, almost like you were touching the bike down but i am not. Its not the paint rattle sound, i dont think that issue effects this year anyway.
There is a plastic dust cover around the rear diff, its the last thing that doesn't spin with the rear tire/wheel. If it has a nicked or dented spot it could rub on the wheel as it spins. I had that problem after a rear tire relacement and fixed it by trimming the bad spot with a razor.