It is listed on its anime official site that the Blu-rays and DVDs of Shirobako will include specials titled "Exodus! Episode 1" in volume 3, releasing February 25, 2015, and another in volume 7, releasing June 24, 2015.
Source: Official site
Shirobako Specials on MAL
Source: Official site
Shirobako Specials on MAL
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Anime