To begin with, here are some minor updates of the upcoming Kamen Rider films, Den-O - OOO - All Riders: Let's Go Kamen Rider and Kamen Rider W RETURNS: Kamen Rider Eternal! In this update stream, we have the confirmed cast as of now and info regarding the theme song of Eternal's film!
Just recently, Toei released the current cast for the upcoming 40th Anniversary film and it seems that there are hints that Kid Ryotaro will not appear in this film!
Shu Watanabe - Eiji Hino/Kamen Rider OOO
Dori Sakurada - Kotaro Nogami/Kamen Rider NEW Den-O
Myura Ryusuke - Ankh/Shingo Izumi
Riho Takada - Hina Izumi
Rina Akiyama - Naomi
Kenjiro Ishimaru - Owner
It is obvious that the OOO cast will appear in this film and the inevitable will happen, Momo will possess Eiji. Jokes aside, basing on this list, even if Den-O is the star of this show, he will either be Momotaros transforming into Den-O or a possibility of a Den-O suit only appearance or maybe, Toei is starting to contact Amuse, Takeru Satoh's agency to return as Ryotaro for the film!
Now to Eternal's film. SOPHIA, Matsuoka Mitsuru's band will perform the theme song of the film. this info was found in W RETURN's official Twitter account. Matsuoka plays Daido Katsumi/Kamen Rider Eternal.
Sources: NeonZ of HJU and DecaEnd of HJU