Hi buddingnaturalis,
I think the current edition of BFSU Volume III, preceded by Vols. I and II, provides a gook background preparation for any further studies in science, as well as a good foundation of “scientific literacy.” Therefore, I have no plans at this time for a second edition of Volume III.
However, if there are particular topics you would like to explore or expand on, that is what this forum is for.
Thanks for question.
Bernie Nebel