After a red-hot third season, the boys of Karasuno High are returning for a new TV anime! During the Jump Festa ’19 event in Japan, they revealed the new series during a stage presentation. They even unveiled a new key visual, along with a new teaser PV:
Unfortunately, they did not reveal whether or not this new anime is a fourth season. They just announced it as a new TV anime, and did not clarify anything else. However, they did say that the new series will have a kick-off event next year, on 22nd September!
As of writing, details are still scarce. However, expect the staff to reveal more announcements in the days ahead, so stay tuned!
source: Comic Natalie