The BMW MOA website has a nice poster / concept image of the 90th Anniversary model.
BMWMOA.org EICMA show
Category: BMW
New BMW to Commemorate 90 Year Anniversary
BMW has announce they will be coming out with a new model in 2013 to commemorate the company’s 90th. anniversary. It will be air-cooled and use styling(?) from their 90 year history. I read a brief writeup on Morton’s BMW web site.