Season 10 is going to be set in Archer’s subconscious version of space, with "a 1970s vision of the future. It will feature "all ’70s clunky set design and production design" with the feel of somebody’s "idea of the future from 1970". There will be nods to the "prevalent aesthetic at the time, of clackity keyboards and hoses and just overall clunkiness," and not to "Aliens" or "Giger-influenced stuff."
Archer’s "not going to know what the future is [like]...he’s going to have a 1970s vision of the future."
In 2016, the creator of Archer, Adam Reed, announced his intention to leave the show after season 10. However, in 2018 it was stated that Archer may be due for more seasons after season 10 and if so, 20th Century Fox will resume production without him.
The end of season 9 features a 3 minute trailer for season 10. (see below)
Season 10 will be set in Archer's subconscious version of space, based on his 1970s idea of the future and will be titled Archer: 1999.
"Unofficial Archer: 1999 Study Guide" from Floyd County Productions employee u/domirillo, which includes some references and inspirations behind the upcoming season.