It was reported several months ago that Disney planned to intersperse the movies of the main Star Wars saga with spin-off films unrelated to the main story, but focusing on specific characters from the saga. As Boba Fett is perhaps one of the most loved minor characters from the classic Star Wars trilogy, it may be no surprise that Disney want to create an origin story for him.
Joe Schnepp revealed the information during a press interview where he said that he knew for a fact that one of the spin-off movies was a Boba Fett story written by Lawrence Kasdan and already in pre-production.
Fett received the origin treatment in Star Wars Episode II: Attack of the Clones, when it was revealed that Boba was a clone of the bounty hunter Jango Fett. It is currently unknown whether a new film would explore this in more detail or take place in the gap between the classic and prequel trilogies.
With the expanded universe no longer canon, it is currently assumed that Fett's death in Return of the Jedi has been reinstated.