What new DoL classes might we see in expansions?

[Enkidoh]

2. Farmer--Was there a shepherd before or am I mistaken?

There indeed was meant to be such a class in 1.0, it was called Shepherd but was dummied out of the game's client, like Musketeer and the original version of Arcanist. There was even a Guild building for it (which was locked) in the hamlet of Owl's Nest in Coerthas (which no longer exists in ARR). Sadly all references to it have been removed in ARR, so we can only assume SE has decided to abandon the class completely.