I’m pretty sure the girl on the far left is Nicoloso da Recco‘s younger sister who is shown in her swimsuit skin(post #4481548). I don’t remember her name exactly, but I think she is Antonio Pigafetta? (I don’t Remember If it’s the right sister ship though, so take it with a grain of salt).
Well one of them got released this week and SS is clearly coming with the next NP event.
From the latest teasers, I'd say Soyuz is finally graduating from the NPC club and Zuihou is taking her place plus Laffey II became playable as well so we'd still have four in the club.