It is conceivable that 12-core and 16-core SKUs with 3D V-Cache from AMD will not happen. As stated by ECSM Official on the Bilibili forum, two new AMD Ryzen 7000 processors with 3D V-Cache technology may be introduced in the first half of 2023. 

But he also says that AMD may only release two Zen 4 SKUs with six and eight cores and 3D V-Cache. Regrettably, ECSM reports no information about future V-Cache chips with a greater number of cores. Still, you should treat the data with caution. According to ECSM's report, AMD's first wave of 3D V-Cache processors will be limited to six-core and eight-core configurations that are easier on the wallet. It is expected that AMD would release them as the Ryzen 5 7600X3D and Ryzen 7 7700X3D processors. With the Ryzen 5 7600X3D, AMD may bring its 3D V-Cache offerings to more budget-conscious consumers than it did with the Ryzen 7 5800X3D.

Now that both the eight-core and six-core Ryzen 7000 have V-Cache choices, the AM5 platform is more accessible to 3D-Vcache processors. However, the value of these chips will be significantly affected by their price, which is now uncertain. For argument's sake, let us say that AMD maintains the same price scheme it did for the Ryzen 7 5800X3D. If this is the fact, the next Ryzen 7000 3D V-Cache chips would likely cost an additional $100 to $150 over its non-V-Cache counterparts.

I was thinking about it; perhaps this is just a logical deduction of available real estate; the 3D V-Cache needs space and data lanes inside the processor package, one chip goes out, and the other one goes in.

Likely only 6-core and 8-core variants of the Ryzen 7000 3D V-Cache CPU will be released.