GAINAX has announced an anime adaptation of the four-panel manga "Sadon-Desu" at Tokyo International Anime Fair 2013.
Sadon-Desu manga official website
"Sadon-Desu" has been serialized by Noir (the wife of Yamaga Hiroyuki
, the President of GAINAX) in Weekly Young Magazine since November 2012. It's a slice-of-life about high school girls who belong to a Sadõ (Japanese tea ceremony
GAINAX also announced two original anime: "Akubi wo Suru niwa Wake ga Aru," which is about a diving girl, and "Tenshi Yoho ~Strange Weathers~" which is a CGI anime movie.
Key visual of Akubi wo Suru niwa Wake ga Aru
Key visual of Tenshi Yoho
Source: Picture of GAINAX panel at TAF2013