My dealer says he has orders for all his allocations this year and some of the next year. He predicts that he'll have full books for the next year shortly after his showroom cars arrive.
Of course, that's sales talk. But from friends working at BMW headquarters I hear similar things... these ///Ms are selling crazily fast.
To reply on your post for figures: no one can predict how they will look in half a year or in a year. But I would not wait on them to improve in case you want one. If you like one of the ///Ms get it, now