Response from author Janice Campbell:
The new edition has a new chapter on how to write an essay, plus a pacing chart (a birds-eye view of what to do in each module), and a clearer, more detailed table of contents. The E1 level has a few new resources, and as in every edition, I've worked to make everything clearer. All the links in each level have been checked and updated (most are the same).
If you already have the second edition, it is still useful, and you don't need to update unless you want to. Just remember that many of the context resources are being moved to our website at http://excellence-in-literature.com, so if you encounter a link that does not work, check there first. If it's not there, try searching via Google or other search engine. A few items completely disappeared due to the retirement of the professors who authored them, and in that case other resources were substituted.