0.8 will have 4 scenes according to Caribdis...it might also entail Dalia's birthday...so...you can add 1 and 1 yourself there. Then there will likely be Annie's first full sex scenes as well and that would only leave Luna and Calypso as the last LIs without a full scene already. Calypso coooooouuuuld get a scene in 0.8, but we don't know that yet. The third one to actually get another scene is probably Nancy, since she didn't have a scene since 0.5.
So Dalia, Annie and Nancy are already 3, leaving a 4th scene which most likely will either be Alex or Calypso if Cari doesn't shake things up.
Imagine Cari throws a curveball at us and gives us another Luna scene
On the real tho, As much as a Caly scene makes the most sense considering what plot points could be brought back up in the story, I'm hoping it's not. Not Alex either, although there could be room to build on that after Dalia gets her scene. In Caly's case I feel like it might become a way too straightforward progression, kinda like with Nova this update (set up at the very beginning, built up all throughout the update, and then big climax with very linear progression. Nothing wrong with that, it's nice regardless and about as right up Nova's alley as it allows.) but I don't think that kind of style will work out with Caly, atleast not in a singular update. Maybe the kraken is being controlled by someone that's willing to give up the heart of the sea for a good time, or maybe the kraken transforms into said someone. There hasn't been any pointers that say Polyjuice doesn't work on animals.
Regardless of what it is, whatever Cari's got in the pot, I don't doubt he'll cook.