Documentation on Slot based query engine

Hello Everyone,
i was going through the keynotes for Mongodb 7 and came across improvement mentioned with SBE.
Apart from a video on YT (which describes in general about the SBE) and some documentation on the official site. But i did not find any good writeups anywhere else . Any idea where can i find more detail description on the Internals of SBE (did look at Mongo Github)