It makes since that dancers are physical damage dealers and not healers, most just expected it to be a healer since it's weird they didn't release a tank and a healer at the same time. I don't see geomancers being a healer. I see it being like a BLM but instead of fire/ice, it will be Water/Wind as per the quest text with tornado's and flood and what not (we don't really have a class that uses much of water. BLU uses very little and WHM just has a single knock back) . They added a lot of new water animations after all. and they say in the AST story that they don't get along, that doesn't sound very co-healer.
I'm pretty bummed healers don't get a new class but it could just mean Range casters will get a new Class and Healers get theirs so they both have 4 as well.