At recent events in Japan, the Haikyu!! franchise has confirmed that the series will return for a fourth season in January 2020.
They've also revealed news of a new OVA special that will feature Nekoma High School, Fukurodani Academy, Nohebi Academy, and Itachiyama Academy fighting for the open spots in the Nationals.
The Tokyo Qualifiers come to life in two entries titled, "Land VS. Sky" and "The Path of the Ball" respectively. The scheduled release is January 22, 2020.
Those attending Jump Festa 2020 in Japan this December will be able to purchase the OVA episodes in advance, while the OVA will go on sale on Blu-Ray and DVD in January for everyone else. There are currently no details for a release in other countries at this time, unfortunately.