A Chinese e-tailer site briefly carried a listing of the upcoming Intel 10th gen Comet Lake-S desktop CPUs qualifying samples (QS) for sale indicating that we may not have to wait much longer before retail units become available. Another site managed to get their hands on a Core i9-10900, but the base clock seems to be lower than what was expected.
https://www.notebookcheck.net/Intel-10th-gen-Comet-Lake-S-qualifying-samples-get-listed-on-Chinese-website-signaling-an-impending-release.453969.0.html