I think they'll most likely add a 3rd set of accessories for nin which might actually give mnk/drg more potential drops if they continue to be made for all classes. I'm thinking that nin might just be the first job that actually relies on skill speed for a main stat over determination/crit rate which would be a game changer in my opinion.

I don't think nin will use Dex, this isn't FFXI and Dex is labelled as ranged damage already which nin is clearly not. The only stat that might have some extra effect on nin might be Int because of the ninjutsu, but that's just speculation.