At around the 22-minute mark, he mentions that the director for the movie is Takayuki Shibasaki. Shibasaki previously directed Episode Yellow of the Chou Den-O trilogy, Kamen Rider OOO Wonderful: The Shogun and 21 Core Medals and the Go-Busters VS Gokaiger movie.
Kento also mentions that he was on set with Ryo Hayami, who portrayed Keisuke Jin in Kamen Rider X. Since they were both on set, it should mean that Ryo Hayami is appearing out of suit, and not simply voice-only. According to Kento, Ryo claims that the staff workers are not as harsh as they were during his time.
Source: Kento Handa’s Ustream