BMW 4 Series seems to be a 3 Series Coupe being rename and it is confirm that the 3 series coupe will be discontinue. Or some may even call this a mini 6 series. 4 Series will be a 2+2 seating and is said to be available in rear wheel drive or rear wheel drive. According to 4 Series Forum, the production will start as soon as July 2013 for all of the F32 and while F33 which is the convertible model will only be starting production on November 2013.
Here is a official TV commercial by BMW Youtube featuring the new BMW Concept 4 Series Coupe