Developers can be weird. I'm not saying they couldn't include ROG on the same list as MNK, but remember that they could easily be referring to pre-50 and handmade gear. You know, the gear already shared between MNK and BRD? It's kind of a no brainer that NIN will be using that gear as well at least until 50.
Assuming they're talking about PRE-level 50 gear, this does not change my original point. All of that leather armor intended for monks has DEX on it to allow it to be used for bards as well. My hunch tells me NIN is going to do SOMETHING with DEX simply because the class or similar classes have always done something with DEX, and for the fact that it would create a balance with all of the different layouts.The keyword though is "melee". They literally used the word melee. STR affects physical melee damage.
Right now: 2 STR, 2 VIT, 2 MND (well, 1 MND 1 PIE but who are we kidding), 2 INT, 1 DEX.
See the gap there? If ROG/NIN was going to be just another melee class, they would've been finished with it already. No, there's something special about it...I'll bet my ugly ass hat on it.