[aquagon]

Hmm, I wasn't aware that Yanagawa had left Gust...
Still, it'll be question of time to see who will be the composers for Ciel Nosurge, especially considering the game is coming out next month.

EDIT: As for Shikata herself, she has confirmed that she will be also composing and arranging part of the music for Ciel Nosurge. This means that she will also make several instrumental pieces in addition to her vocal numbers.