This was mentioned over on DPR, it's a camera system attachment Xiaomi were showing which uses a 100MB 4/3 quad bayer sensor:
https://www.gsmarena.com/xiaomi_modular_optical_system_concept_handson-news-66797.php
I can't find any sample images...
The sensor is 3:2 not 4:3 which is confirmed by the image dimensions you've posted. The 4/3 in the name of the sensor refers to the size not the aspect ratio so although most four thirds sensors have had the 4:3 aspect ratio, they don't have to...
I went to have a look at the DNG files but surprised to find my raw processor doesn't support them which I didn't think was possible with DNG files.
Something that surprised me in the review was it says the sensor is 3:2 not 4:3, some of the...
I think it's the same in the UK, the current fly more package for the Mavic 3 Pro is £2300 which I think they reduced recently from £2500 and I was surprised to see the Mavic 4 at £2500.