The ever-helpful Review of Biblical Literature has published a "review" by James Sanders (of the Ancient Biblical Manuscript Center) of Biblia Hebraica Quinta Fascicle 18: General Introduction and Megilloth.

I place review in quotes because it seems to be less of a review and more of a short history of the development of modern editions (handbook editions or handausgabe, not critical editions) of the Hebrew Bible. As such, the eleven-page review is well worth reading. If you've ever wondered about the differences between the BHK editions and BHS, and what the differences will be in BHQ, then you should read this.

One of the footnotes in this review contained a reference to another review (by Sanders) of the Hebrew University Bible Ezekiel volume. This as well has a historical overview that may be helpful to read.