First, the new GPU is not based on the Navi 21 XTXH chip which has been used by AMD previously for its top-end enthusiast 6900 XT variants. Instead this is a new chip apparently dubbed "Navi 21 KXTX".
AMD Radeon RX 9000 series is right around the corner. Here's everything we currently know about AMD's next-gen RDNA 4 graphics cards.