'Haikyuu!!' Gets OVA

Amazon Japan lists that manga Haikyuu!! will get an OVA bundled in its tankoubon volume 15, to be released on March 4, 2015. According to the official anime site, it will be the episode that streamed on Jump Festa 2014.

Source: Amazon Japan, Official site (ジャンプスペシャルアニメフェスタ2014上映「ハイキュー!! リエーフ見参!」がJC「ハイキュー!!」15巻アニメ付予約限定版としてDVD化! part)