The i7-8086K would be a limited anniversary edition marking 40 years since Intel first launched the 8086 16-bit microprocessor. Spec-wise, it is very similar to an i7-8700K, but the base and boost clocks got bumped to 4 GHz and 5.1 GHz, respectively. With proper cooling, the i7-8086K could be overclocked easily to 5.0 GHz and beyond.
https://www.notebookcheck.net/40th-anniversary-Intel-i7-8086K-CPU-specs-and-performance-get-leaked.299254.0.html