Sherlock’s Jonathan Aris is probably in Star Wars: Rogue One
There’s no official casting announcement here, but this sounds pretty hard to deny: According to a report from the BBC, Sherlock actor Jonathan Aris (he plays Anderson, the forensics guy who hates Sherlock but becomes obsessed with his “death”) recently added Star Wars: Rogue One to his Spotlight page, which is basically an official online résumé. The listing has since been removed, but the BBC grabbed a screenshot that shows he’s playing someone named Senator Jebel.