I have seen the theory of the Samurai because of the director name, and the Blue Mage since Spiderman uses power given to him from a "monster" type.

The more I thought about it the more I like the idea of the new job being Dancer or pherhaps Acrobat, (Not sure which FF game had acrobatics), the more sense it made to me, seeing as Spiderman is quite acrobatic.
Dancer descriptions mentions that they are acrobatic in their movement and combat, normally with hidden blades or daggers.
Hidden blades makes more sense since in the Stormblood trailer you can somewhat see the outline of a blade as she swings at the WoL, or it could simply just be the movement effect of her hand swinging fast in a cinematic effect.

SE could just make a completly new job and name it Acrobat, and all of these hints are made to throw us off and we are looking too deep when it comes to directors name or Spiderman showing up once in a Samurai armor but instead we become blind to the most obvious he wanted to tell us, that Spiderman's traits is that he is acrobatic and has nimble movements in his way of combat.

Personally I hope we get Samurai and then surprise, extra job Dancer! Like how they did with Astrologian despite saying only 2 jobs this time because balancing new jobs takes too much time.