Nizaris brought us a first hand account, plus photos, from the [wiki]Book of Cain[/wiki] signing at Book Soup in West Hollywood last weekend. In his report Nizaris mentioned some of the Q&A details, including a tidbit about how Blizzard is still hashing out details of “the [[Abyss]],” which is apparently where the various Prime and Lesser evils are banished to when they are defeated in the mortal realm.
If you want more details on that issue, plus other Book of Cain topics, check out the video of the Q&A from the signing. It runs 16 minutes, and the sound is pretty good. Thanks to HolyKnight for the tip.