Disney Gallery: The Book of Boba Fett will drop on Disney+ on May 4 to celebrate Star Wars Day.

The official description can be seen below:

“‘Disney Gallery: The Book of Boba Fett’ explores the behind-the-scenes story of the legendary bounty hunter’s return to Tatooine with mercenary Fennec Shand, seeking to claim the territory once run by Jabba the Hutt. In this insightful new special, filmmakers, cast and crew reveal never-before-seen footage, groundbreaking technology and the practical effects that brought it all to life.”

https://thedirect.com/article/star-wars-day-2022-disney-plus

I enjoyed “Disney Galleries” for The Mandalorian, so I hope I will enjoy this as well. And the “never-before-seen footage” are unused scenes or alternative shots from the series itself.