They were intending to bring it out in late 2020 but it’s now been set for a February 22nd, 2021 release.
After originally releasing a Planetes Blu-ray box set back in September 2009, Japanese distributor Bandai Visual opted to bring it out again back in 2016.
The anime adaptation of Planetes was released in North America by Bandai Entertainment, but since the company’s closure it hasn’t been rescued yet.