Marc is happy to answer any of your questions in the comments. I really liked the feel and construction of the 4th edition, which was done by Royal Jongbloed as well.
New to this Edition:
-Twenty new essays and introductions, including new essays on Time/Calendar and Languages of the Bible
-Fully revised and updated annotations to reflect the latest biblical scholarship
-Introductions and extensive annotations for each biblical book
-Informative essays on essential topics for biblical study
-Color maps, timelines, glossary, and an index to study materials
-Includes the Apocrypha