Again, I'm pretty sure he stated it's a concept-not a fully fleshed out idea :P And I think it would be nice having an actual support class healer as well. The bard is a nice touch, and while it does add some nice benefits- I think the dancer can stand on its own quite well. There are plenty of classes that stack well together so this would just be a new combo to work with.

As far as other skills, again-CONCEPT.
*Although I'd like to see what else a dancer could do *
An esuna ability would be useful but again, I'm sure that just wasn't thought of at the moment.
And as a healer, if she gets no swiftcast, I sure as hell wouldn't mind having an Aoe revive, considering how long it takes to cast the darn thing in the first place.
If anything it seems the what limitations the dancer has are compensated with all the aoe's and such. Some tweaking here and there and we may have a winner