What BMW models will this support? Funny that the graphic shows the i8 which just ended production last month and will not have a successor.
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And then when they backtracked, iDrive 6 didn't even allow CarPlay to go full screen. My 2020 X4M Competition displays iDrive 3/4 of the screen with a giant "CarPlay" icon at the right in split screen. It took people on eBay to release a hack via USB port to go full screen... BMW still no comment.
Since you mentioned CarPlay on a BMW, I have a 2017 430xi, purchased CarPlay then promptly disabled it, total waste of money. CarPlay maps didn't have the detail, smooth operation, feature set and real-time updates as the BMW maps and as you intimated, only filled half the screen (maybe an intentional act by BMW). Anyway, the BMW iPhone integration (music, phone, contacts, maps, etc.) was far superior to CarPlay.