All theories have basically been said. The only 3 plausible for me are.

- Sam Raimi theory = Samurai (I honestly doubt it with the hint yoshi-p dropped in an interview of spiderman having different directors)
- Bitten by a spider, gain spider powers = Blue mage (most plausible even if I hope it isn't)
- Spiderman agility = Dancer (The one that I'll hope it will be, but have my doubts about. Even though it's plausible in my opinion)
- Web strings = Puppetmaster (Seems unlikely, considering there are better marvel heroes to hint that)

Personally, I hope that they make some kind of Dancer / Blue mage hybrid class. Satisfy both crowds. And the dancer/blue mage garment always had something of an arabian belly dancer. Not to mention that Blu/Dnc in ffxi used to be a common thing.