Incidentally, there was a fourth Discipline of the Land class called Shepard in 1.0 that was dummied out of the game like the original intended version of Arcanist and Musketeer - they even had a Guild building (that was locked) in Owl's Nest in Coerthas. However, in ARR it seems to have been completely eliminated (the very town it was situated in seems to have disappeared off the map completely), so whether it's still planned for inclusion is anyone's guess.