I bought an 08 SL FWD on Saturday. Already noticed not only noise but a slight vibration coming from I assume the tranny when very lightly accelerating between 15 and about 28 mph. I already called dealer and then saw and joined your site moments ago.
I'm even more concerned about the issue now that I see others have experienced it.
We'll see what they say.
I'll try to get it to the dealer today or tomorrow and will update you all later.