I'm pretty curious to what they have in store for Dancers. It is one of the DPS jobs that are at capacity during the 2min burst windows. What they can even fit? An upgraded Standard Step would be questionable since sometimes it won't even fit with the Saberdances. Another oGCD can be a problem if sometimes there's too many feathers to use. The only way I see is actually improving things you do outside of the TS windows.
As of a change I'd really like to see would be Closed Position having its recast time removed, basically being applied more freely, like its PVP iteration. This 'free' partner swap could lead to some interesting optimizations with jobs that have strong actions in the odd minute windows. Also minor, but a variation of CP to be usable on the dancer themselves to not be as shafted on solo scenarios.