The novel found at Scrolls of Lore is titled World of Warcraft: Dechados, which was translated as World of Warcraft: Paragons. It seems an apt title for a collection of short stories about Azeroth's leaders -- and there's the fact that the translation of the description also mentions the inclusion of a novella. After doing some further digging, we managed to find a French version of the book as well. Both books suggest a September release date.
At present time, there doesn't appear to be a peep about an English version of the collection, however -- and it definitely wasn't mentioned at the San Diego Comic Con Licensing panel this year, either. What's the fate of Blood of the Highborne? We aren't certain, but judging from the information found, it may be out sooner than we'd previously thought.