OK, we will see 18.3.1 early next week and 18.4 B1 either near the end of next week or the beginning of the following week.
Would match with what happened two years ago with iOS 16, where 16.3 released in the last full week of January, 16.3.1 released at the top of the second full week in February and 16.4B1 released near the end of that week on February 16.
That’s my speculation.
I also speculate that we will see 18.3.2 sometime throughout March, probably around the launch of the M4 MacBook Airs.