Lastly, the announcement didn't state if Matsuyama will appear as L in a flashback sequence or in the film's main story. It was previously reported that Sousuke Ikematsu will play Ryuzaki, a character that is considered to be L's successor and wants to surpass him.
The upcoming film stars Masaki Suda (Kamen Rider W) as Yuki Shien, Masahiro Higashide (live-action Parasyte) as Tsukuru Mishima, and Sosuke Ikematsu (The Last Samurai) as Ryuzaki. Directed by by Shinsuke Sato (Gantz) and is set for an October 29 release.
[Source: Anime News Network]