This year is the 5th anniversary of TV anime series Haikyu!! (ハイキュー!!). During Jump Festa 2019, the anime announced a comeback after two years of absence.
Haikyu!! has got three anime seasons and the last finished in December 2016. The announcement today does not say whether the coming series is the 4th season.
More information about the series will be available in the kickoff event held on 22nd September 2019.
Haikyu!! is a volleyball manga created by Haruichi Furudate (古舘春一) and serialised on Weekly Shonen Jump. Here is the official description provided by English publisher Viz:
“Ever since he saw the legendary player known as “the Little Giant” compete at the national volleyball finals, Shoyo Hinata has been aiming to be the best volleyball player ever! Who says you need to be tall to play volleyball when you can jump higher than anyone else?”