My first guesstimations based on the specs from CES.
~45% average FPS uplift for a chip at the same die size (60% higher FP32 TFLOPS).
Memory modules may be 28-36 gbps. Memory bandwidth is currently not a pressing concern unless the gains are huge which they won’t be. Global caches may see changes but in design rather than sizes. I hope the focus as well on local caches and register files but I dooubt it unless it is to bring tensor cores and shaders even closer for that neural rendering workload.
Based on my modeling;
GR203: ~ 5090, but more like 90-95% of the performance
GR205: ~ 4090
GR206: ~rx 7900XT level
GR207 is tough, die size may shrink or stay the same,
Shrink: ~rtx 5060, (around 25% gain)
Same: ~5060ti, around 45% gain