The Debian 11 "Bullseye”Will be released in 2021 but as of today we know that the theme he will use is called Homeworld. It theme Homeworld was created by Juliette Taka and is inspired by the German Bauhaus art movement, which began in the late 19th - early 20th century.
The users they will see the Homeworld theme in several places when using Debian 11. One of them will be in the Debian installer.
Homeworld will exist as wallpaper and on the screen connections.
Following a call for new topics, a total of eighteen options were submitted. In a poll the projects received 5.613 votes and the Homeworld theme was the top choice of users.
If you have run Debian 8 or Debian 9, you will have come across works by Juliette Taka since she created the themes Lines and softWaves used in these two releases.