I wouldn't worry. It's way too early to make any judgements about the G20 interior based on what is seen in spy shots. I can tell for sure that iDrive screen isn't what will be in the actual car. I think the new 7er and the upcoming 5er will yield much better clues to what the G20 interior will look like. BMW isn't designing in a vacuum. They're well aware of what their competition is doing. I expect the G20 interior will be along the lines of the new B9 A4.
The 5 and 7 seem to be similar, but it's 1, 2, 3, 4 that share similar parts.
For me, the F3x's interior design is not a problem. I could live with my current interior forever--it's simple and functional. Most of the enhanced functionality will come through software anyway, so minor tweaks to the interior (as there are to the instrument cluster) are probably enough.
What I don't like is the way it's been put together--too many rattles and squeaks.
Also, there is very poor insulation. When the stereo is playing even at very low volumes, it can be heard when standing outside the car with all the windows and doors closed. I don't remember that being the case with my E46 (or any other car that I have owned).