At the very least, I'd hope they would keep the classical naming style they've been using thus far, as it in my opinion it adds layer of sophistication as well as the image that these classes are actual professions.

I'd personally like to see the introduction of Musketeer, Fencer, and some sort of Assassin-type class as well. More DoM classes such as Arcanist, Mystic, and some sort of Evoker class would be nice changes of pace as well.