The Intel Core i9-9900K processor should be designed with a 14nm++ lithography, it would have 8 cores and 16 threads, with a base frequency of 3.4 GHz, a 5 GHz Turbo frequency. Its L3 cache would be set to 16 MB.
The rumors announced it on August 1, 2018, then in September 2018, then during the first quarter of 2019. And finally now in October 2018. The last date seems the most plausible, the respective roadmap on this date is very similar to what Intel published lately. Processors in 2, 4 and 6 cores will be launched at the same time, as well as refreshed versions of Basin Falls, ie the Skylake-X until the processor with 18 cores. For the 22 and 28 cores, it will be necessary to wait the second quarter of 2019.
Its price should be 450 dollars according to specialists. That would be amazing because it could be more powerful than the Intel Core i9-7900X which costs 900 dollars. And the Intel Core i9-6900K was released with a cost no less than 1200 dollars.