I just installed 2022.12.3.7.5 this morning. I haven't driven it so haven't noticed any changes, but going from 2022.12.3.2 to 2022.12.3.7.5 is probably not going to have user visible changes.
I hadn't seen a fifth number before, but maybe I just haven't been paying attention. I wonder what they call that field in the data structure? {Year,Week,Release,Patch,WTFSeriously} ?