...No, it won't be their final appearance.
Up up girls, Kikka & Sayaka may not be H!P but they are closely related. The difference is that they are STILL IDOLS. People who graduate H!P become talents or whatever. They ~graduate~. Up up girls, Kikka & Sayaka have only completed their Egg training and are now idols who have some sort of contract with UF* considering their promotion. Kanna, Aibon or ex-Egg Irori for instance have shit to do with UF* anymore, so they're not included.
SHITDAMN. HOW DETAILED DO I HAVE TO EXPLAIN THIS SO IT'S UNDERSTOOD.