Keep in mind that a new caster DPS has yet to be released since SMN came out with the launch of 2.0. Also, the only melee was albeit a later release, but it came out under the old system of class/job combos in 2.0. By no means is this any sort of guarantee, but it is something to keep in mind.

Yes, we have more DPS jobs, but we also NEED more DPS jobs. We are 2:1 for every tank and healer, and even more so when it comes 5:3 in 18-man content.

I wouldn't be surprised if we get a melee and caster in 4.0.