The official Pokémon movie website has updated. Translations follow:

The "Oha Suta" Episode Airing Monday December 11th Will Have the World Premiere of the Latest Pokémon Movie News!

The "Oha Suta" (airs on the TV Tokyo Network Monday through Friday at 7:05am) episode airing Monday December 11th
will have the world premiere of a grand reveal of the latest news on the Pokémon movie premiering Summer 2018!
What kind of adventures will you be able to see in the next movie? Make sure not to miss "Oha Suta" Monday December 11th!

Official Oha Suta website: https://www.ohast.jp/

Source: http://www.pokemon-movie.jp/news/?p=3151