A lot of this information has already been released, but here are the composers/arrangers for the new single as confirmed by
j-book.
Mirrorcle World
music: Yuta Nakano
arrangement: Yuta Nakano
Life
music: Tetsuya Yukumi
arrangement: Yuta Nakano
YOU (10th Anniversary Version)
music: Yasuhiko Hoshino
arrangement: HAL
Depend on you (10th Anniversary Version)
music: Kazuhito Kikuchi
arrangement: CMJK
Seems like Yuta Nakano has a lot of range as an arranger, having done 'Mirrorcle World', 'Life', and 'decision'.