Just want to point out that people shouldn't be looking at the girl in the cinematic and saying she is either 100% a Monk or 100% a Dancer. First of all, it's a cinematic that is artistically stylized, but it is also important to remember that certain NPC do not follow the same job restrictions that we do. We have seen examples of characters that use abilities beyond what their job would normally allow. Not everything is black and white.

My honest opinion of the lady in red is that she does portray herself as a Monk, but she might be mixing in some Dancer moves. Alternatively, the opposite could be said, but just based on the what is shown in the footage I would say she is mostly in line with Monk.

Also let us not forget that speculation on Dancer as a possible job addition for Stormblood has more behind it than a cinematic video. It has been previously stated that the Moonfire Faire provided hints towards the upcoming jobs. For that reason, I still believe we are getting three with either all three upfront or with one already in the pipeline to be added in a patch update. But in any case, there is still the matter of the yellow ranger pose being identical to one of the poses used by Dancer in FFXI. I do not believe that is a coincidence.