Oh, my. What is going on with Rogue One: A Star Wars story?
You get a promising up and coming director in Gareth Edwards to helm your Star Wars story, which is written by top established writers in Gary Whitta and Chris Weitz. Going into it, Lucasfilm and Disney executives knew that this was an offbeat tale - it was a one off story about the group of rebels that managed to steal the Death Star plans that they then deliver to Princess Leia, which opens the tale of the original 1977 Star Wars film. There was not going to be a Rogue One: Part II, or anything like that; it was a standalone film set in the Star Wars Universe.
However, after the massive success of the JJ Abrams-directed Star Wars: The Force Awakens (Episode VII), the powers that be want Edwards flick to appeal to a "four quadrant" audience (that's males and females, viewers aged 25 years and under, and over 25 years old). In other words instead of getting a cool, dark, serious combat movie that was likely to appeal to most Star Wars fans and much of the public, they are reshooting a large chuck of the movie to appeal to EVERYONE.
According to sites like The Hollywood Reporter, Academy Award-nominated writer Tony Gilroy is reworking the script and possibly overseeing some reshoots. Also, noted 2nd Unit director and stunt maestro Simon Crane is working his action magic as well.
Hopefully Gareth Edwards' movie is still in there once all the reshoots and reediting are done. I guess we will see this December.
May the Force be with them.