Given the "Return to Ivalice" raid series we're getting this expansion and that Sky Pirates were a mainstay of XII (which may be the biggest reference in the RtI, what with the remaster coming out this month), it's likely we may see Sky Pirates again, or at least other groups of them.

Stormblood doesn't have as big an excuse as Heavensward given the "sea" theme this expansion, instead of the "sky" theme in HW, but we'll need to reach Ivalice SOMEHOW.