Looks fake to me with just a hodgepodge combination of current BMW cars into one photoshopped car (the wheels being the biggest giveaway of it being a PS). But let the speculation go fourth ..
Either way, its a great look at what the general shape of the upcoming PAS would be like: An X6 silhouette on a lowered more sedan like body.
Credits to
http://www.WorldCarFans.com for the image