My 2011.5 E92 creaks like crazy too. Since day 1. I told my SA that it has more rattles than the M Z4 I came from, which makes no sense given that that was a convertible.
I have a new loose rattle (2500 miles now) sound now coming from something beneath the ashtray. That's in addition to one from the rear seats, the left A-pillar, and the glovebox. It's really the only thing that stops me from truly loving my car. HATE IT.