Snapped these on Sunday. Looks like G30 5 Series and the tailpipes, bumpers, and shadowline trim would indicate an M5. Wheels look like they could be off a last-gen M5 too.
It was very quiet though, even quieter than the F10 M5 in comfort mode under normal driving I’d say.
I suppose they’re trying to test it in its natural environment. There was a lovely navy blue 280SL Pagoda and a new brown Bentley GTC like a block from there too.