That would the classes would have to have five after the fourth spec they get. Really confusing and not needed.
Yes the custom models would be also good for the next expansion, but I'm sure it might happen, but we haven't any updates on the new models either so I don't know and Blizzcon 2013 is coming to.
Argus would be perfect to for the new place to go, but I would like more places for Azeroth first and then go to Argus to and have it as a large planet area like Azeroth, but more like Outland to in which it had more into the wise of having good content and other stuff to.