At an event "Chou Hidamatsuri Z" held on April 5th, special episode(s) of "Hidamari Sketch x 365
" was announced to be released. The release date and the number of episodes haven't been given yet.
Source: Hidamari Sketch official website
According to the poster notice, the special episodes will be aired on October 17th and 24th.
Source: Scan of the poster