I am now formatting the Python SFC models book. I am trying a new layout technique, so no promises for the delivery time. I was going to do a promotional summary today, but other things popped up. I may do one shortly, but I wanted to just put up an announcement rather than miss publishing on my regular publication day.
UPDATE: The initial formatting pass is finished, but there are still some kinks to work out. I will be waiting for the printed proof before publishing, and so the publication date will not be immediate.