The official Pokémon movie website has updated. Translations follow:

Media Information

Magazines:
Tuesday May 21st: "V-Jump" - Material related to the Ancient Mew card
Tuesday May 21st: "Corocoro Ichiban!" - Information on Armored Mewtwo
Friday May 24th: "Cheese!" - Shogakukan-sponsored pre-screening

*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=3641