Specifications of the Intel Tiger Lake-H Core i9-11980HK have come to light indicating 200 MHz higher base and 300 MHz lower boost clocks compared to its predecessor, the Core i9-10980HK. The leaked specs also indicate that the Core i9-11980HK may potentially offer improved AVX-512 performance when the TDP is configured up to 65 W.
https://www.notebookcheck.net/Intel-Tiger-Lake-H-Core-i9-11980HK-specs-10-nm-Enhanced-SuperFin-chip-offers-300-MHz-lower-boost-than-Core-i9-10980HK-but-clocks-higher-in-AVX-512-at-65-W-cTDP.526552.0.html