Currently at the moment there isn't much news in the ebook world. Most of the good guides have not been updated. But this is soon to change.
You may not now that The Wrath of the Lich King will becoming out soon. As a result this means that there will be a flurry of updated books. I will keep you updated when the time comes.
In the mean time check some of the previous posts about some of the guides I have reviewed. I hope you keep enjoying world of Warcraft.