Unless they want to get cuh-rayzee (which they have repeated over and over that they do not feel like they are ready to take that step.) I wouldn't expect another dex-based pure ranged DPS any time soon. The logic behind that isn't necessarily over playstyle rather than stat distribution.

We currently have 2 STR DPS, 2 INT DPS, and 3 DEX DPS. The addition of yet another Dex DPS would only make the distribution of Dex accessories even more bloated than it already is. I've pegged it as the most logical step for awhile that it would make the most sense to add two DPS when they decide to expand on classes once again. Mainly to even out the rest of the stat distribution. From there I think it would be most fitting (probably in say, 5.0 assuming that the ship doesn't sink.) to then expand a full party from 8 to 10 players, and then finally add support as it's own role, opening up room in any group to actually add a pure ranged DPS class.