The Core i5-9600K is a six-core, six-threaded model, with a 3.7GHz core and 4.6GHz Boost. Next we have the eight-core, eight-threaded Core i7-9700K, which offers a 3.6GHz core and 4.9GHz Boost. Last we have the Core i9-9900K, which appears to be the only Hyper-Threaded model, this one has eight cores and sixteen threads, a 3.6GHz core and a 5.0GHz Boost. All three chips have a 95W TDP.
The launch is expected within a couple of weeks.