I know that Tobs has said publicly that the resolution of the whole arc started with KinuQuest
will be done as a family and take place in the Astral Plane. Kiyoko's design doc (
here) mentions a bit more about that, but we don't know how much of that initial plan is going to happen or if it does, how it might change by the time it gets in the game from what the doc says. By way of example:
The whole thing about potentially siding with Taoth against the kitsune that's mentioned in Kiyoko's doc was jettisoned quite some time ago because nobody wanted to write it and given the amount of content on the 'Keros' side it was considered too much of an uphill climb to balance out the alternative route, so that branch was just cut entirely. Character docs (or at least the ones people not part of the core team can see) don't necessarily get updated so don't take it as guaranteed that what it says is what we'll get, but it's something to think about at least.