The closest car in the current BMW lineup to this 5 Series Concept GT would probably be the X6, although BMW is takin gpains to emphasize the differences.
For one, it's not as high as the X5/X6 SAV, being just a bit higher than the normal 5 series sedan. Think of it as BMW's answer to the MB R Series, Chrysler Pacifica, or even Volvo XC70.
I have to admit, this is the first BMW in a while that I don't "get." I heard all the talk in the video about market research and "creating a new type of vehicle," but turning the classic, elegant BMW 3 box sedan silhouette into a raised, 2 box fastback doesn't make much sense to me.