New leaked slides show that the Comet Lake-S desktop CPUs are scheduled to replace the current gen 9 Coffee Lake-R models in early 2020. Intel will release a new 400-series chipset to support the upcoming CPUs that come with up to 10 cores / 20 threads and TDPs of up to 125 W. Unfortunately these will not be compatible with current motherboards, as the slides reveal the necessity of a new LGA 1200 socket.
https://www.notebookcheck.net/Intel-s-Comet-Lake-S-CPUs-will-require-new-LGA-1200-sockets-launching-early-2020.427323.0.html