Well, it turned out to be a non-event. There indeed IS PRECheck for Terminal B and I sailed right through it with only a couple of people ahead of me. Even the non-Pre line only had about 20 people. This was right at noon today. Good Friday.
So everyone update your data base. No need to go through the hassle of going to T-C just for PreCheck.
However, and very unfortunately, there is no Club in this terminal and I intentionally arrived 3 hours early just to chill in the club.