Chapter 0 of Rurouni Kenshin Manga in August

Shueisha through the website for Jump Square magazine announced Rurouni Kenshin manga will release the Chapter Zero in the Weekly Shonen Jump magazine in August.
Quoted from ANN, "Jump Square will begin running Watsuki's Rurouni Kenshin -Cinema-ban- (Rurouni Kenshin: Cinema Version) starting with the magazine's May 2 issue. The series will focus on battles fought with characters from the upcoming live-action film."

I am not sure what it (the series will focus on battles fought with characters from the upcoming live-action film) means and I do not know what will be the chapter zero because the movie is upcoming.

Source: Manga News via ANN