Well: I just dug this out
http://www.e90post.com/forums/showthread.php?t=774601 to see how things are evolving.
One question though, if the UKL platform is also xDrive compatible, and BMW will be offering 3 cylinder engines, that push out 160-230hp, then wouldn't there be room to mount the 3 cyl longitudinally, and just take drive to the rear wheels as the xDrive would.