There have been plenty of conflicting reports about the iMac Pro, a more powerful alternative to the 24-inch iMac. Purportedly, the iMac Pro may not arrive until the summer, potentially during WWDC 2022. It could feature more than 4,000 mini-LEDs though, along with 1,000 dimming zones.
https://www.notebookcheck.net/iMac-Pro-Apple-s-27-inch-120-Hz-and-M1-Max-powered-desktop-may-launch-in-June-with-over-4-000-mini-LEDs.599914.0.html