who can we expect to turn their collar this year?

That’s also a long list! I’ll break it down by district again:

Gion Kobu: Katsue (佳つ江) - scheduled for May 2017, Kiyono (清乃), Mikako (実佳子), Shōko (彰子). Mameroku and Katsuhina already had their erikae this year.

Pontocho: Not likely to have more, but possibly Ichinana (市奈菜). Hisamomo already had her erikae this year.

Kamishichiken: Katsuna (勝奈) - scheduled for May 2017, Ichitaka (市多香), Umechie (梅ちえ).

Miyagawa Cho: Toshimomo (とし桃), Toshisumi (とし純), Koume (小梅), Koyoshi (小よし). Satoharu already had her erikae this year. 

Gion Higashi: Fukuharu (富久春).