Recent announcement by avex about Kamen Rider Zero-One the Movie & Kamen Rider Saber the Movie's Ending Theme had also confirmed the list of cast who are going to appear in both the movie.
Kamen Rider Zero-One the Movie
Fumiya Takahashi as Aruto Hiden / Kamen Rider Zero-One
Ryutaro Okada as Isamu Fuwa / Kamen Rider Vulcan
Noa Tsurushima as Izu / Azu
Hiroe Igeta as Yua Yaiba / Kamen Rider Valkyrie
Daisuke Nakagawa as Jin / Kamen Rider Jin
Syuya Sunagawa as Horobi / Kamen Rider Horobi
Nachi Sakuragi as Gai Amatsu / Kamen Rider Thouser
Daichi Yamaguchi as Ikazuchi / Raiden Uchuyaro / Kamen Rider Ikazuchi
Satsuki Nakayama as Naki / Kamen Rider Naki
Asumi Narita as Shesta
Kazuya Kojima as Jun Fukuzoe
Hideaki Ito - Esu / Kamen Rider Eden
Seiji Fukushi as Bell / Kamen Rider Abaddon
Hirona Yamazaki as Akane Tomo
Mei Hata as Moore / Kamen Rider Abaddon
Yuu Oyama as Lugo / Kamen Rider Abaddon
Hirooki Goto as Buga / Kamen Rider Abaddon
Nakayama Kinnikun as Fukkinhokai Taro
Keisuke Minami as Lawyer Bingo
Suzuka Ohga as Mashiro-chan
Akira 100% as Makio Nodachi
Kamen Rider Saber the Movie
Syuichiro Naito as Touma Kamiyama / Kamen Rider Saber
Takaya Yamaguchi as Rintaro Shindo / Kamen Rider Blades
Asuka Kawazu as Mei Sudo
Ryo Aoki as Kento Fukamiya / Kamen Rider Espada
Yuki Ikushima as Ryo Ogami / Kamen Rider Buster
Eiji Togashi as Ren Akamichi / Kamen Rider Kenzan
Hiroaki Oka as Tetsuo Daishinji / Kamen Rider Slash
Les Romaneques TOBI as Tassel
Masashi Taniguchi as Bahat / Kamen Rider Falchion
The three Megids, Kamen Rider Calibur's actor and Mei Angela are not listed in the cast. So they are not going to appear in the movie?