Limited spell options for WoW Character Classes

Something I realized while testing out some builds from the new World of Warcraft books: Since all the WoW classes, both the originals and ones that are copies of standard D&D classes, are implemented as their own separate class in the system, they don't have access to my extended spell libraries from all the various sourcebooks I have. Any Blizzard class only has access to the basic 5.5 spell list and the WoW-specific stuff. Is this something that's going to be updated? Because being able to apply far fewer options to the Blizzard classes makes playing as those versions quite a bit less enticing.