There have been early reviews of the 11700K, and it’s not looking that good (around 1.5% faster in gaming workloads than the 10700K on average). The 11900K will most likely be a bit higher binned version of the 11700K (since the 11900K will be a 8C/16T part instead of a 10C/20T part like the 10900K).
Anandtech has that review up:
Save bet is the 5600X or 5800X. They’re great CPU’s. Motherboards are cheaper as well, and everything overclocks without having to go for a fancy K version of the CPU and a fancy motherboard.
A lot will depend on pricing though, and of course, wait for more independent benchmarks once it’s officially released.