It was announced that spin-off manga Hidan no Aria AA
will get an anime adaptation. More information will be announced at a later time.
Source: Scan via tweet
Update December 18
It was announced by Gangan Online that the manga's anime adaptation will be a TV anime. Mediafactory's YouTube channel also has an announcement PV updated.
Announcement PV: https://www.youtube.com/watch?v=zl-rAivd0e4
Source: Gangan Online
Hidan no Aria AA