The announcement was made by David McAfee, the VP and GM of Ryzen CPU and Radeon graphics at AMD. According to his post on X, ...
The GPUs will be built on a 4 nm process, presumably from TSMC, an upgrade from the 5 nm process used for the 7000-series ...
Apparently, AMD didn't talk about GPUs at CES because it wants to hold a separate event for those announcements.