I posted a series of videos of lectures David deSilva delivered on the 4th Annual EO Celebration Cruise last year. In the comments section, deSilva noted that Hendrickson Publishers were going to publish a revised form of these lectures and that it would be out in time for SBL in November.
After scouring the Hendrickson website, in which case I could find nothing, I have found this info elsewhere:
The volume will retail for $19.95, and it weighs in at 144 pages. Here is the cover art:
In my opinion, deSilva along with Craig Koester, are the two leading experts on John's Apocalypse, so this volume will definitely be worth purchasing.