Recently, information about the long-rumored Obi-Wan Kenobi movie came out that purported to include a plot synopsis of what the movie would be about. However, there's something a bit odd about it. The description, which included Obi-Wan getting involved in a dispute between Tattooine farmers and Tusken Raiders, is actually identical to the plot of the Star Wars Expanded Universe novel Kenobi, which makes the information appear to be even more questionable than it already did.
Lucasfilm has never confirmed that an Obi-Wan Kenobi movie is actually happening, so every piece of information that comes out about it needs to be taken with a grain of salt, but Twitter user Anthony Taylor pointed out that that the plot description that dropped and the Amazon synopsis of the novel Kenobi are strikingly similar, right down to some of the phrasing, such as the Tusken Raiders being led by a "ruthless war chief."
While this similarity almost certainly means that the plot synopsis actually came directly from the novel, there's always the possibility, however remote, that this is because the novel is actually inspiring the film. While the Expanded Universe of Star Wars novels are no longer considered official canon, they have clearly acted as both direct and indirect inspiration for the current crop of films. Han Solo and Leia had a child that turned to the Dark Side in the novels before Kylo Ren was ever a reality, and Grand Admiral Thrawn made the leap from Heir to the Empire directly to the Star Wars Rebels animated series. The novel in question takes place during the same time period in the Star Wars universe that an Obi-Wan Kenobi movie would be expected to be set, anybody who was working on a script for such a film, and, again, we don't actually know that anybody is, would almost certainly make themselves familiar with the book.
Still, the more likely answer is simply that the rumored plot synopsis doesn't actually exist. It doesn't mean that the Obi-Wan Kenobi movie isn't happening, but it does remind you that rumors are always rumors until they're not. Even if work is being done on this idea, it doesn't mean we'll ever see it. There absolutely were real plans to make a Boba Fett movie at one point, but that project ended up being shelved before it ever went into production. That could certainly happen here for any number of reasons.
Lucasfilm is almost certainly planning some sort of movie for 2020. At some point, we'll find out what it is. Until then, we'll keep tabs on all the rumors and see which ones turn out to actually be true.