Agreed. The holes look exactly like the Aux In mod for the iPod/iPhone earphone output offered from 2005 onwards as a retrofit.
It took the form of a 3.5mm jack socket wired to the back of the Nav/Audio head etc. Mine was in the glovebox - BMW official location - and I used it for about a month before getting something else. No remote functionality!
Last edited by X5Sport on Mon Jun 22, 2015 9:20 pm, edited 1 time in total.