The official Pokémon movie website has updated. Translations follow:
Media Information
Magazines:
Friday March 15th: "Monthly Corocoro Comic" - The latest illustration & information on the movie
Friday March 15th: "Corocoro Aniki" - The latest illustration & information on the movie
*Note that these are the scheduled publication dates, and as such are subject to change without notice.
Source:
https://www.pokemon-movie.jp/news/?p=3603