BMW have used the perfect cover up IMO. A normal trunk and licence plate, just there where everybody would expect it. So no questions and remarks, it is so normal as ever.
Now a trunk is easy to replace, it can be done just previous to it`s final presentation. Off course we do not know what the definate shape of the bumper/trunk/licence plate will be, let us be surprised............................
If it`s gonna be the licence plate on the bumper..............................then BMW did some extraordinairy camouflage.....