No need to wonder, they've made it pretty clear. Ninja is a confirmed melee dps job, it will be STR main, no need to overhaul the entire game to make it DEX.

They have another class coming that most don't talk about, ranged physical attacks of a gun, clearly a DEX player.

On topic - I got my UAT, tokens and soldiery tomes all waiting for me to hit 50 with NIN