No way that is Maserati GT. It has Maserati badge at the back, crome trim around window, indicator area is way different, not to mention the rear lights.
Nope, it's not a BMW (but it does have alot of BM bits under the skin) and it's not a concept either. It's a real car, if you had the cash you could go and buy one today, but you'd probably have to go to Germany to pick it up !