The official website of Kōhei Horikoshi's My Hero Academia manga published a new promotional video and a new visual for 4. season on Sunday.
My Hero Academia Promotional Video:
The anime is going to premiere on October 12, and will air on NTV and YTV on Saturdays at 5:30 p.m. Funimation is going to publish the premiere of the anime at the Anime Expo event on July 6. Funimation will also then stream the season as similcast.
The anime's first 13-episode season premiered in April 2016, and then the 25-episode second season premiered in April 2017. The 25-episode 3. season premiered in April 2018.
Funimation streamed the English dub of 3. season. Hulu and Crunchyroll streamed the series simulcast with English sub. The My Hero Academia: Two Heroes film opened in Japan last August.
Source: My Hero Academia anime's website