After thinking a bit, it makes sense that Apple isn't using OLED on the 27" because they have to do tandem OLED to get near the brightness that miniLED gets...and also these displays would cost $6,000-7,000 if they went that route.
They took learnings from the Pro Display XDR and lowered the cost by lowering the size of the display and adding new features. Is $3299 still a lot for most people per display? Sure, but looking at it holistically it's a good deal especially for folks who want a consumer priced display that has decent color accuracy with high NITS HDR ability, not even counting 120Hz feature here. So anyone making HDR content can get these displays and do fine work. Anything above this, actual Pro level work will require $20,000 displays and PCIe cards that output HD-SDI with HDR functionality.
Hopefully next few years we will see tandem OLED within this price range and they can move down miniLED to the regular Studio Displays because having nice blacks and 2304 active spots is a good deal. Hopefully and eventually flat back panel LEDs will go away from Apple's lineup.
I won't be getting this display because I need 2 of them, so it will cost me $7,000 after taxes, but it's nice to see where Apple is going here. I will stick with the original dual Studio Displays they are a workhorse and good enough for what I do.
Bright OLED is still pricey and miniLED is also pricey. I wouldn't be surprised it these panels Apple uses cost $1000+ for them. Seems like a custom panel which I can't seem to find in any other product, hopefully with a teardown we'll get a better idea as to who makes them. There's a
part number here but no company named.