They most likely will not implement tools that you have to keep buying. They learned how bad that was from how the archer/bard used to be. They used to have to buy arrows all the time. Also, I don't see them implementing a blink mechanic that functions in the way it did in ff11. Yoshida has already said before that it is ludicrous to have a ninja tank as the whole point of being a ninja is to not be seen. And I really do not see it working that well in this game anyways considering how the game is set up. The ninja would be either far too weak to tank, or far too overpowered. Also, it probably will have access to a skill that reduces enmity. Probably a stealth skill. It is just pure speculation on my part but I would bet on it being pure dps.