As was pointed out earlier in the thread, the Merc VGT "actually" being built appears to be an unfulfilled pipedream, and not something that Mercedes were ever actually going to do, but a coach builder (who may well have been staring at legal issues for ripping off someone elses design) that wanted to charge nearly $2,000,000 for a re-bodied SLS GT. Pesonally I think it's about as likely as a Devel Sixteen
Because the basic shape of the BMW VGT is pure 2 series, all it really needs is a body kit, and to be honest I'd be surprised if people aren't already working on one that mimics the VGT already - infact the BMW M2 seen testing appears to already add some of the elements (wider fenders).