According to Shonen Ace magazine, an OVA of Hyouka was announced to be released in January 2013. The Blu-ray will be bundled with the third volume of the manga. A fanservice episode at a swimming pool will be animated.
Hyouka official website
Trailer of the TV series
The first episode of the TV series will be aired on April 22nd.
Source: Scan of Shonen Ace
Hyouka (OVA) on MAL
