User blog comment:CureLightning/Part 5 announced??/@comment-26426093-20161229013035

I suspect that barring a complete miracle, Lily will trounce both Yume and Laura and take over Hime's spot in the S4.

With no known admins in Moon Beauty, and after such a strong showing in Episodes 31 and 34, Mahiru is in a prime position to usurp her sister's S4 status (Sorry Koharu).

Ako...this is why BNP should have introduced a proper rival for her. Ako is too OP in my opinion, to the point where I find it difficult to comprehend that no one else can match her equally in all of Bird Theater. At the very least, both Mahiru and Laura had rivals to deal with. Also, the fact remains that while she's undergone quite a bit of character development since her debut, we still know nearly nothing about her past or motivations (not counting her obsession with Subaru-kyun). But regardless, and with no other rivals in sight (with the exception of Arisa), Ako should be succeeding Tsubasa next year.

And for Wind Dance, only Yuzu remains. Perhaps Ruka could get upgraded to main character status next year? Who knows, maybe we will see.