This will be the coupe version of the BMW 3 Series that should have been introduced to the public only next year. Seems someone didn't like the attention given to the Audi RS6 Avant, so they "leaked" some pictures today.
Underneath is basically the same as the BMW 3 Series. It will use the same four and six cylinder engines, diesel or gasoline, and a six speed manual gearbox or a eigh speed automatic transmission.
In this concept, the differences boil down to the bumpers, full leather interior and rear lights. No more information is available but i expect BMW to release more information soon.
Picture Source: AutoHomeChina