Voiced by James Earl Jones… and not bodied by David Prowse. Apparently that particular feud was ported over to the new owners. And I can’t… actually, I’ve decided to not have an opinion on said feud. Life is too short.
As for Darth Vader being in Rogue One: well, geez, easier to have him in there than to say why he’s not, right? I mean, it’s taking place when he’d be around, and all they need to do is to have James Earl Jones read some dialogue. I assume that JEJ is hale enough to do that, and it’d be cool if he did.
