A set of leaked documents from BMW's dealer presentation in the Netherlands the other day led to some breaking news concerning the BMW M550dX. We learned that the M550 diesel will run on an all-wheel-drive configuration and put out a healthy 375hp. Well, according to the same documents the German automaker will also release a new M-tuned vehicle for next year. The M135i will be based on the 1-Series hatchback's platform.

It will put out 320hp from its N54 twin-turbo 3.0-liter 6-cylinder engine. The 320hp output is a step up from the stock 135i model, which gets only a 306hp output. The BMW M135i should debut next summer, while an xDrive variant could make its way out by December 2012. Photos displayed are of the 2012 BMW 1-Series Hatchback M Sport Package and BMW 1-Series Performance Studie Concept.