While we in no way endorse this rumors, we like them (from Winding Road):

>A German source with direct knowledge of the goings-on tells us that what is currently in testing is a stripped-out lightweight setup using the twin-turbo six installed in the 135i (as well as in the 335i and 535i). The engine will be set lower within the body work as well to bring the slight top-heaviness of the 3.0-liter twin turbo motor closer to earth, thereby immediately improving cornering abilities. No word on power output upgrades yet, but the acceleration number to 60mph is, according to our source, “pleasantly under 4.5 seconds.”

+ BMW Confirms What We ‘ll Get if We Get a tii / Winding Road