So basically the same as the Z9 but in a smaller body with smaller battery.
It will be interesting to see the flippy/tiltly screen in a smaller body.
The price difference will be fascinating of course being 3 years behind the R5 and the relative cheapness of the Z9 vs R3
I can't understand the dual CFe type B/USHii implementation though. CFe cards aren't new now and the space volume consumed and price are almost the same. It will impact dual recording for video and buffer clearance.
Yes, running dual CFe could be hotter.
Yes, SD cards are fully backward compatible and helps to import to PCs without a card reader but you need the card reader for any high bit rate video anyway. At this pointy end it seems just to be product segmentation rather than cost/functionality.