Bandai Visual revealed some solid information previously regarding the upcoming release of the Mobile Suit Gundam Thunderbolt: December Sky home video release as well as the theatrical event, which itself hits on June 25th, 2016.
The Thunderbolt Sector is a shoal zone composed of the debris of destroyed space colonies, named for the electrical discharges from the metal debris.
The project has Kou Matsuo directing it and working on the scripts with it naturally being animated at Sunrise.