It would require a fundamentally new audio engine that allows to funnel individual channels to other speakers.
Roon RAAT (Roon Advanced Audio Transport) is able to handle multichannel streaming. In case B&O would decide to go on Roon RAAT at least they had a streaming protocol that is able to handle it. No need to wait for airplay / Apple.
But I doubt that B&O is interested to move from the red to the blue ocean (see W. Chan Kim and Renée Mauborgne)