During the TV rebroadcast of anime "Suisei no Gargantia
" today, it was announced that it will get a sequel. Information on format, story, staff, and cast is not disclosed yet. "Suisei no Gargantia" is a original, science-fiction anime made by Production I.G and aired from April to June in 2013.
Source: Official anime Twitter
Suisei no Gargantia OVA