The rumours of the 12900KS surprised me a bit, I thought they'd already pushed the Alder Lake design to it's limits with the 12900K. It definitely seems like an E-Peen edition (purely to say AMD doesn't quite have the performance crown with their Zen3D series), and does make me wonder how many will actually be produced.
I wonder if the temps will be stupidly high, like 100 Celsius plus - That's what the 12900K gets if overclocked to 5Ghz or above (except if high end water cooling is used, I assume).
The best cores are heading into the low power “T” parts and potentially low end enterprise, though it looks unlikely the demand will be high for those. Intel could probably squeeze some extra margin out of those cores.