This one is sort of a brain-scratcher. Storefronts have started listing Core i9 KA versions of Intel's 10th Gen processors based on Comet Lake-S. The A part of the suffix is one we've never seen Intel use before - the K denotes an unlocked multiplier, which allows for chip overclocking, and Intel's F chips denote ones without integrated graphics built into the silicon. however, KA is a new one. It's being postulated online that these could be CPUs that don't achieve Intel's Boost clocks - but are capable enough of running at the stipulated base clocks for their K-only cousin.
These have been listed on Lithuanian shops, and pricing seems to be mostly in-line with that of Intel's F CPUs. The listed CPUs are the Core i9-10900KA (part number BX8070110900KA), with a 3.7 GHz Base clock, for €525; the Core i9-10850KA (BX8070110850KA) with a 3.6 GHz base clock, for €485; the Core i9-10700KA (BX8070110700KA) with a 3.8 GHz base clock, for €408; and the Core i9-10600KA (X8070110600KA) with a 4.1 GHz base clock, for €278. All CPUs also seem to have the same L3 cache size. That Core i9 naming scheme on the 10700KA and 10600KA though... Seems very, very strange.