Might want to wait for the GOTY to come out.
Game guides are usually available on release day, and rarely re-released for DLCs until all of them have come out.
A new game guide was already released to include Dawnguard and Hearthfire. Additionally, Shivering Isles had its own game guide. Double additionally, the new game guide for Skyrim is WAY too damn big to add another expansion. Chances are Dragonborn will either get its own guide, or nothing at all.