The Intel Core i9-11900KB, Core i7-11700B, Core i5-11500B, and Core i3-11100B are now official. All four desktop processors are based on the 10nm Tiger Lake architecture. They are custom-made for small form-factor machines and may not be available to the general public.
https://www.notebookcheck.net/Intel-launches-four-new-Tiger-Lake-desktop-processors-for-small-form-factor-machines.541645.0.html
It maxes out at 32 EUs instead of 96 EUs, so pretty much useless. It could have taken on the Cezanne desktop APUs.
As far as I know, Apple was the only OEM that I remember that used these weird B models on the Mac Mini.