They may be announcing their more value-oriented Ryzen 5000 processors then, like a 5600 (non-X) at a more competitive price point. With prior generations, they launched them all at about the same time, but then not many would pick up the higher-clocked parts, since the performance differences were typically quite minor, especially after an overclock, which made it difficult to justify paying a big premium for them. This method gives early adopters more incentive to go with those models though.
It's been rumored that the 5600 may be priced around $220, though it could potentially see different pricing. I would expect it to be at least under $250 though. And there will probably be a more value-oriented 8-core, 16-thread model as well.
It's possible they could hold out on announcing those parts until closer to Intel's Rocket Lake launch in the spring, but a January announcement at CES seems more likely.