It was a lot of set up that, thus far has had no resolution other than "some really cool stuff happened but we decided it was more important to have all these multi-series crossovers so DS9 just sort of skipped over it. Trust us, it was really, really cool."
Cynical me says: sounds about right.
But I don't know if it'll be completely glossed over. Otherwise, wasn't it in...
So it makes me think it's not going to be completely dropped, but rather will form Lost
-esque foundation for flashbooks in the DS9 books.
But who knows.