Over in China a video has been posted of some guys testing the six-core / six-threads Core i5-9600K, they also overclocks the proc to 5200 MHz on all cores.
They used a Z390 platform based on MSI Z390 MEG and posted a video on it. There are no game benchmarks in there, but you can read out some cinebench scores at 1,034 CB and 1,207 by overclocking. That's Core i5-8600K territory. Core i5-9600K will cost roughly $280 dollars.
Official processor reviews you may expect to be released on Friday, we expect to see you here then.
First Benchmarks Core i5-9600K Leak, Overclocks to 5.2 GHz On Air