An announcement made at AnimeJapan 2014 revealed that a new 2-episode OVA
for Suisei no Gargantia will be released with the first episode coming Fall 2014. So the BD release of ova 1 comes out around November 21st, 2014. OVA 1 releases that came out before that time are bandai channel stream encodes. They’re watchable, just standard quality. The 2nd ova is scheduled for release on May 27th, 2015.