I would be surprised about Ships/Pirates.Maybe it is a bit nostalgia goggles speaking. I just miss when the faction revolved around the graveyard, with Strengthening units and some transforming into beasts in the graveyard and all that. The little graveyard manipulation we have now doesn't really compare to that. Maybe if they ever get to sorting the SK Beasts archetype out we will see more of it.
Judging by the flavor text on the expansion page it seems to be Weather focused cards. I'm thinking it will be more Ships/Pirates support which is cool too. Maybe ships that gets boosted if there's Rain on the board and such.
Hopefully it won't ultimately end up somehow just empowering Warriors more like what has happened before.
Given the "using ancient rituals" description can be found on PlayGwent I would assume it should be Druid support.
This would also make sense given the Magic focus of the expansion, with each of the other factions being focused on them (even MO).