Gunblade...that is all

[Jaykos]

A gunblade could be cool. I'd like to see a combo melee ranged class tho but as more of a gangplank style cutlass and musket class which would fit nicely in the ff14 world.

[Kajidourden]

One word: Musketeer
They've already proven with arcanist that they are using to at least some extent what was there in 1.0. Also, limsa is still the only city with only two classes, and of course, the musketeer just fits perfectly in the limsa theme.
What it will be as far as role is concerned...not even going to try and speculate, too many possibilities. Either way, the next time there's a content update or expansion where they try to be elusive and just say "a new job is coming" you can be pretttty sure it's musketeer

[Ultimatecalibur]

Currently there are 6 "Gunweapon" models in game (excluding the Blazefire saber), a generic gunblade (used by ranking Garlean troops), the gunblade Heirsbane/No. IX (wielded by Gaius van Baelsar), the gunshields Tartarus (dual wielded by Rhitahtyn sas Arvina), the gunhalberd* Bradamante (formerly used by Nael van Darnus), the gunbaghnakhs Algea (used by Livia sas Junius) and the gunhammer Mjolnir (used by Nero tol Scaeva).

As of right now they have the models to arm the Gladiator with a gunblade and gunshield, the marauder with a gunhammer, the pugilist with gunbaghnaks and the Lancer with a gunhalberd. They may just be wait for the right time or trying to figure out a way to give them trigger actions to make them feel like gunweapons.

*Bradamante is interesting because it seems to be currently in the hands of a infamous weapons collector and may be one of the rewards for completing a battle on a big bridge.