An apparent Intel Core i9-12900K qualification sample has been spotted in a few benchmark runs carried out via PugetBench. The i9-12900K was on an Asus ROG Strix Z690-E Gaming WIFI motherboard, and it produced scores that put both the i9-11900K and AMD Ryzen 5950X in its sights.
https://www.notebookcheck.net/Intel-Core-i9-12900K-on-Asus-ROG-Strix-Z690-E-Gaming-WIFI-board-targets-i9-11900K-and-AMD-Ryzen-9-5950X-in-unsupported-benchmark-run.556373.0.html