Pictures from this week's issue of Weekly Shonen Champion have revealed that the limited edition 12th volume of Masahiro Anbe's Shinryaku! Ika Musume (aka Squid Girl) manga will include an original anime DVD (OAD). The 12th volume is the next volume, which will be released on August 8th, 2012. More details will be revealed in future issues of Weekly Shonen Champion.
Hopefully this will be included in the second season release by Media Blasters. Unless Media Blasters gives up the license to someone else seeing as they are a much smaller company now.