It has officially been announced!
It has been posted by several official Digimon twitter accounts that episode 4 will be airing in Japan on June 28th! It will air in the normal timeslot in Japan on Fuji TV and will be released onto Crunchyroll a few hours later for the people who live outside of Japan! You can watch episode 1 to 3 for free right now without a needing a Crunchyroll premium account by clicking here!
The official tweet can be found below:
— Toei Animation (@ToeiAnimation) June 19, 2020