Pricing information for Intel's upcoming 11th gen Rocket Lake-S chips have leaked on Belgian retailer 2compuite's site. According to prices listed by 2compute, the Core i9-11900K looks to be about 10% cheaper than the Core i9-10900K. However, other retailers seem to show a 10% increase in pricing making it a tad difficult to infer anything until Intel officially announces the MSRPs for Rocket Lake-S some time during end of Q1 2021.
https://www.notebookcheck.net/Intel-Rocket-Lake-S-price-leak-indicates-Core-i9-11900K-to-be-10-cheaper-than-Core-i9-10900K-and-close-to-Ryzen-7-5800X-but-lack-of-MSRP-info-makes-pricing-comparisons-difficult.515478.0.html