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Let's have a look at these fuckers, shall we?
It's definitely going to be a 1-stage mon. I wish for a 500 but I'm being realistic and assuming a 480 BST (based on a sort of middle ground between Furfrou and Hawlucha, two single stages that were introduced last gen), and GameFreak logic tells me it'll have about equal physical and special offenses to make it mixed and let it fully take advantage of the various dance moves. My stats predictions are as follows:
HP: 80
Atk: 90
Def: 70
SpA: 85
SpD: 75
Spe: 80
I don't think it's going to see any usage in singles, period. It's ability is way too gimmicky and niche and is not going to be able to stand much of a chance against thing that do use Sword's or Dragon Dance. Doubles is where it has potential to shine, provided GameFreak aren't incompetent retards and make it mimic ally dance moves as well.
In practice, it's going to be physical 9 times out of 10 because of the broad availability of SD/DD allies, and it's only ever going to be special if it's partnered with a Quiver Dance-knowing Volcarona or Vivillon (why).
We don't know if its learnset will change between forms, but at least it gets Revelation Dance which gives it a STAB for its secondary type (please be physical and please don't make it shit). Acrobatics seems like a likely move it will learn, which could be really interesting and would allow for some fun gimmicks. Brave Bird and Roost are also expected, but I don't know of how much use they will be in practice.