Somehow, Apple has packed a workstation with up ... That said, it is the same panel you get in the regular 27-inch non-Pro iMac, so if that’s the bit that interests you, you don’t need to ...
For now, Apple released the 27-inch 5K Studio Display. It is essentially the same display panel as the 5K iMac, but designed to look like a cross between the 24-inch iMac and the Pro Display XDR.