Here's some info on the re-shoots from Entertainment Weekly. Sounds like business as usual.
"In our own deep-dive into the rumors, we found that about five weeks of reshoots were set, wrapping up just before Star Wars Celebration in mid-July.
Our confidential sources also revealed that Bourne screenwriter andMichael Clayton filmmaker Tony Gilroy was being brought in to write additional dialogue and direct some secondary units on the movie — alongside director Gareth Edwards, who collaborated with Gilroy in a similar capacity on 2014’s Godzilla.
The movie has not been screened for test audiences, but EW’s sources on the film say that Lucasfilm’s in-house braintrust — which weighs in on films similarly to the way it’s done at Pixar — felt Rogue One needed to punch up its emotion and action beats. (They also confirm that although it went largely unreported last year, The Force Awakens also underwent weeks of reshoots in the summer of 2015.)
Further, Director Gareth Edwards commented on the challenge of conducting reshoots with a large and diverse cast:
“Obviously, you’ve got to work around everyone’s schedule, and everyone’s on different films all over the world, and so it’s a bit of a logistical nightmare,” he said. “That’s why I think it’s been blown out of proportion a little bit.”
It seems that the company line remains that the reshoots are business as usual and this is all part of a process that was laid out from the beginning. One issue in particular that has come up in various reports is whether the reshoots were needed to change the tone of the film:
Kathleen Kennedy, the president of Lucasfilm and producer of Rogue One, said the tone of the movie — which was billed as a Band of Brothers-style combat tale at last year’s Celebration event — isn’t being altered.
“There’s nothing about the story that’s changing, with a few things that we’re picking up in additional photography,” she said. “I think that’s the most important thing, to reassure fans that it’s the movie we intended to make.”
And here's some pics.
And finally some info on Forest Whitaker's character who we have seen before.
He is playing the part of Saw Gererra from The Clone Wars. He appeared in S5 and played a big role in helping the Rebellion in it's early stages.