BMW Marketing is really smart they keep the info. on new features a closely guarded secret. One of the reasons why BMWs sell so well is that they have the introduction of new features all figured out, which keeps their sales high throughout a model's lifespan. For example if we look at the 3 series, midway through E36 model they introduced the 2.8L engines, bumping the top of the line 2.5L but it was still available but they were calling it 323 (maybe to not frustrate the 325 owners), then E46 the initial 2.8L was bumped by a 3.0L midway, and then again I can only imagine how frustrating it must have been for the early model year E90 owners to find that the top of the line 3.0L they bought could now be had for a few grand less in the "new" 328 and the top of the line is a mouth watering 3.0L TT.

From your post it seems that the new iDrive is important for you, I would suggest just wait for that to be available and pull the trigger else BMW will continue playing these mind games and they won't be the ones suffering.

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2008 E70 X5 3.0si
Sport | Prem | Adaptive Drive | Tech. | Cold Wthr | Rear Climate | 3rd Row | Running Boards | iPod/USB

2019 G30 530e
Sport | Adaptive | Drv. Assist+ | HK | HOV Access

2018 F83 M4
Comp. | Exec | DCT | First M Car

2009 E93 335i (Sold)
Sport | Prem | 19" 230 | Logic 7 | iPod/USB | Sat | HD Radio | Comfort Access | Heated Seats | Pure Joy

E36 328is GoKart (Sold)
Manual | HK | Trip Comp. | 17" Rims