Short OVAs for Kuroko no Basket Announced

According to the official website and Amazon, every volume of the BD/DVD series for Kuroko no Basket (both limited and normal editions) will contain animated bloopers, which will be based on the extra section of the original manga series.

There is also an episode 22.5 listed on the 8th volume of the BD/DVD series. It is unconfirmed whether this will be an unaired special or a recap episode.

Source (Japanese): Official Website, Amazon(JP)

Kuroko no Basket Special on MAL
Kuroko no Basket Episode 22.5 on MAL