Is it scratch proof?
The most innovative thing here would be, how you would get to slide it in and out day after day without battering the hell out of the MacBook casing.
Anyway it is surely the most obvious, space saving and minimalistic way to dock a laptop to a screen and keyboard.
Now I have just thought that there should just be enough room to put 1 or 2 laptop HDD(s) into the docking unit as well. Hence providing a backup or additional storage solution to boot.
Now you heard it here first so if Apple use that idea, then I WANT MY FREAKING MONEY!