The official site for "Senki Zesshou Symphogear G
" lists OVA short episodes for volumes 5 and 6 of the BD/DVD, scheduled to be released February 5th and March 5th, respectively.
All volumes will also include bonus Original Soundtrack CDs (one per volume) 1-6, PVs, CMs, TV spots, recording digests, and credit-less versions of the OP and ED.
Source: Official website
Story by hpulley
Senki Zesshou Symphogear G: In the Distance, That Day, When the Star Became Music... OVA