The problem is, that the existing classes, rogue, mage and fighter are kinda the "holy trinity" of rpg classes. No matter what the new class is, it is either a variation from one of these or some sort of mixture of them.
- Monk -> Mage with a spice of Fighter (unarmed/staff combat)
Knight -> Armor-specialist Fighter
Paladin -> Holy Fighter (Fighter with a spice of Mage)
Thief -> Kinda the same job as Rogue has
So they should propably specialize the existing classes a little bit more, so that there is more room for a new class. Of course, I might be wrong, but I hope you understand my fears; I don't want to see another fighter, mage or rogue with a little bit different spice.
My proposition would be a
huntsman, an expert in bows, spears and traps. Of course the bows should be taken away from rogue then...
But I trust in AH's judgement and decisions.