https://www.pcgamer.com/intel-inadvertently-reveals-9th-generation-cpu-lineup-but-no-8-core-chip-in-sight/

Intel appears to be readying a new round of processors that will be marketed as 9th generation parts. While nothing has been officially announced, several new 9000-series SKUs appear on a couple of Intel documents that were recently made public, one of which Intel promptly pulled offline.

That would be the Microcode Revision Guidance (PDF), a document that was updated with a bunch of 9th generation processor models, including the Core i5-9600K, Core i5-9600, Core i5-9500, Core i5-9400T, Core i5-9400, Core i3-9100, Core i3-9000. No other details were listed, and trying to load the document now brings up an error page.