I'm not saying the new gun class is going to be... but its going to be...

[Aliquis]

They just wont be equipped separately, on and off hand like FFXI or other games. It will be a paired main hand slot, Like monk had been on FFXI and is on XIV. Screenshots of rogue/ninja are dual wielders this is confirmed.

[AzakaTonnerre]

They just wont be equipped separately, on and off hand like FFXI or other games. It will be a paired main hand slot, Like monk had been on FFXI and is on XIV. Screenshots of rogue/ninja are dual wielders this is confirmed.

The problem with this theory is that rogue/ninja will dual wield two of the same type of weapon in main/off hand and it makes sense to pair them. What you're describing is not.

In 1.0 when they added auto-attack it was speculated that a dagger would be added to archer for close up attacks. SE said at the time that this would not be the case because the armory system is based on the weapon that's equipped. Allowing them to equip both a dagger and a bow would in fact not fit within the armory system and no close up weapon was added. That fact, as stupid as it seems, is the reason a bard/archer punches when it is up close for its auto-attack.

While I hope your speculation is true, based on what they did with archer to solve the ranged/up-close attack does not lend to it being the case (barring a change to the armory system).