The rumors I've been hearing is that the top RX 8000 series card isn't going to raise performance and may actually be a slight regression due to the biggest die configuration running into development issues and being canned (and thus no RX 8900XT/X), but it is supposed to be a jump in performance/watt and performance/$. They're supposedly going back to monolithic GPUs for the whole lineup while they work out some of the issues with using chiplets for graphics (also, increased demand for advanced packaging due to AI may have driven up production cost and created a bottleneck), and the ray tracing hardware is getting a huge overhaul.
I think the rumors going around were that the 8800XT (name not confirmed) is going to generally land between the 7900XT and the 7900XTX in raster (maybe closer to the XT than the XTX), have improved RT/AI performance but downgrade the VRAM to 16gb on a 256-bit bus, and cost between $500-600. It's gonna mess up the value on the top RDNA 3 cards for sure, but I don't see the 7900XTX falling $100+ below the 8800XT if rumors are true.