A few new bits of info from the Q&A session that followed AMD's event:
* AMD claimed that they were allowed only 45 minutes by CES, which wasn't enough time to announce and go over everything, and that they want to hold another event for gaming stuff at a later date. They didn't give a date (other than "Q1"), though, which makes me wonder if they weren't quite ready to do a detailed announcement, anyways, and are waiting on Nvidia and, specifically, the announcement and pricing of the 5070.
* AMD confirmed that FSR 4 does currently require an RDNA 4 GPU, since it's designed to take advantage of its machine learning capabilities, but they intend to evaluate its performance on older architectures, so it may eventually be backported.