For a long time it was speculated that the Star Wars spinoff that Josh Trank was hired to make was a Boba Fett movie, but there was never any real confirmation of that.
Now it looks like Entertainment Weekly confirmed that was the movie Trank was working on, and they even produced a teaser for it that would’ve been shown at Star Wars Celebration last year:
“After the release of the new film, the Star Wars braintrust will map out the further reaches of the galaxy. Among the titles that have been considered is a Boba Fett/bounty hunter movie that director Josh Trank was hired to make before he dropped out following the troubled production of his Fantastic Four reboot. It came so close to being officially announced, Lucasfilm even prepped a teaser reel to show at Star Wars Celebration in spring of 2015, sources tell EW. At the last minute, the split with Trank backburnered the project.”
It’s entirely possible that the Boba Fett movie could still happen after Episode IX. That would make it the 2020 Star Wars release. At one point it was even speculated that such a movie could tie-in with the Han Solo spinoff, showing how that Han had a history with the bounty hunter who took him to Jabba.