Zum für 2016 geplanten Spin Off Film unter Regie von Gareth Edwards (Monsters, Godzilla) gibt es nun auch ein paar erste Informationen:

The first live-action Star Wars movie that isn’t an “Episode” will be a military adventure focusing on shades of gray, instead of black-and-white morality of previous Star Wars films. With absolutely no Jedi. [...]

First up, what is Rogue One about? The official synopsis (released by the Star Wars twitter account) was released — confirming the long-rumored “heist movie” plot: “A band of resistance fighters unite for a daring mission to steal the Death Star plans in Star Wars anthology film, Rogue One.” [...]

According to Edwards the film is set after Return of the Sith and before A New Hope. [...]

According to Disney Insider, the Jedi are basically extinct at this point, so Rogue One will be a pretty Jedi free film. The cast of characters will not have superpowers, but will still find a way to bring hope to the galaxy. This is truly the very early stages of the Rebellion.
Everything We Know About The First Star Wars Spin-Off Film, Rogue One