WARNING SPOILERS AHEAD FOR THE SEASON 2 FINALE OF THE MANDALORIAN
I would advise watching the Season 2 finale of The Mandalorian before reading any further.
A while ago it was reported by Deadline that a secret Boba Fett project for Disney+ had started production ahead of the Lucasfilm presentation where they revealed a heap of new films and series set in the Star Wars universe. Missing, however, was this Boba Fett project and know we know why.
Today, it was finally confirmed by Lucasfilm that the Boba Fett project is indeed happening and will be coming to Disney+ on December 2021 under the title of The Book of Boba Fett.
While the announcement itself isn’t considered a spoiler, how they did it might be.

The teaser footage was presented at the end of The Mandalorian Season 2 finale as a stinger with Fennec Shand and Boba Fett returning to Tatooine then taking over Jabba’s Palace by killing Bib Fortuna. Telegraphing that he’s now taking over that crime synicate which might tease what the upcoming project will be about, the gangs of Star Wars.
The assumption is that Temuera Morrison and Ming-Na Wen will star.
It’s still unclear if this is a full-on series with 8-episodes or simply a 4-episode limited series like Obi-Wan Kenobi.
We still don’t know who will be writing and directing the project but announcements will likely coming soon. This makes the third spinoff announced by Lucasfilm alongside series such as Rangers of The New Republic and Ahsoka, all three are assumed to be taking place within the timeline of The Mandalorian. Allowing further crossovers in the future.
SOURCE: DISNEY+