So I went to my dealership to test this yesterday. There was a non iDrive on the lot. I turned on the radio and plugged in my android via USB. I clicked on audio then selected the USB input. The small screen in the radio said "loading". After a few minutes there was no change so I unplugged. Not sure if it would have worked had I kept it plugged in but I don't think so.
Any X1 non iDrive owners who can comment?