The thing that triggered me was the sudden cut-away from the weapon the woman was using that was not her fists, but the cloth with a blade on it that was used as a sort of mid-range weapon.

Weapons are the strongest indicators of new jobs, and if they were trying to keep Dancer under wraps, yet tease it slightly, having only brief instances of the use of the weapons would be the best theoretical method.

So yes, unconfirmed Rumor, but it does fit. Dancers often have moves resembling flowing martial arts, and historically FF dancers did use cloth as weapons (as well as daggers, swords, etc in more muti-faceted games, but cloth was often their most unique weapon) so seeing a glance of a cloth being a weapon is a heavy hint to us FF historians.

Looking forward to confirmation or debunking in the future.