The official website for Haikyu!! announced that Haikyu!!: To the Top 2nd-Cour will begin airing 2 October. TOHO Animation YouTube channel released a series of trailers featuring the opening theme by SUPER BEAVER and ending theme by SPYAIR. Production I.G. is in charge of the animation production.
15-second trailer featuring the opening theme by SUPER BEAVER:
30-second trailer featuring the ending theme by SPYAIR:
Crunchyroll describes the Haikyu!! To The Top as:
The Karasuno High School Volleyball Club finally won their way into the nationals after an intense battle for the Miyagi Prefecture Spring Tournament qualifiers
As they were preparing for the nationals, Kageyama is invited to go to All-Japan Youth Training Camp. At the same time, Tsukishima is invited to go to a special rookie select training camp for first-years in Miyagi Prefecture. Hinata feels panic that he’s being left behind as one of the first-years and then decides to show up at the Miyagi Prefecture rookie select training camp anyway…
As they prepare for the nationals, Hinata, Kageyama and the rest of the Karasuno High School Volleyball team get ready to face some new challenges!!
Source: Haikyu!! Official website & Twitter