Seiyu Yuzuki Ryoka
announced in her official twitter that she will release an original anime DVD at Comiket 79 to be held this December. Yuzuki said "Don't expect too much because it's a private and indipendent anime."
Yuzuki has been participating in Comiket privately since 2009 and releasing her photo books and radio CDs.
Yuzuki in K-ON costume (Comiket 78)
Source: Yuzuki's twitter