The boost clocks reported by 3DMark for the 6-core / 12-thread Rocket Lake-S CPU suggest that this could be a replacement for the Comet Lake-S i5-10400 CPU. The disappointing part is that there are no performance gains as far as CPU cores go, as the Rocket Lake-S engineering sample proves to be slightly slower than the Comet Lake-S model. It does, however, deliver better graphics performance thanks to the new Xe iGPU.
https://www.notebookcheck.net/6-core-12-thread-Rocket-Lake-S-CPU-early-benchmarks-reveal-disappointing-performance-gains-over-Comet-Lake-S.466247.0.html
Basically, slightly worse performance than Ryzen 3600 at the cost of new socket. I think the only Comet Lake cpu that makes sense is 10600K. 10900K and 10700K are too damn hot, require ridiculous 3-slot AIO. 10400 and 10500 are easily beaten by Ryzen 3600. 10600K is slightly faster in games, and comparable at productivity to 3600, so has a little advantage. But again - it costs $90 more, requires beefy cooler or AIO and 1200 mobos are ridiculously overpriced, so we are talking like almost double cost compared to generic 3600 build. Well, hard to justify any single cpu from this Intel's gen.