Anyone notice it appears that at 1:32 into the video, the dancer's section, that Tachi:Kasha is being done by a RDM with a sword? (New animation too)
"(someone mentioned that maybe dancers unlock these skills for party members, but the clips with the weaponskills show no dancer fighting)."
This leads me to believe that dancers can do something to give another weapon a different weapon skill, maybe within the jobs in a party. Perhaps this is SE's way of trying to get back to skillchain, magic burst?
I doubt, it really, because if you watch again, the sections that showed the new ws's did not include a dancer in the party. Pretty sure they're just going to be new ws's.