Each chapter of the story includes a synopsis of the events in each particular game or patch. In addition, the guide contains video trailers and key art for every chapter. If you've ever been wanting to get into the lore of Warcraft, but simply didn't know where to start, this guide is for you. According to Blizzard, more bonuses like wallpaper and character cards for various Azeroth heroes will be added at a later date.
This is a pretty amazing guide, and it's something Blizzard has desperately needed for a very long time. I'm glad we've got an outline out there for people to follow. Blizzard is also taking suggestions for future updates -- check out the official announcement post and leave your comments if you have any ideas to share.