Michael Giacchino has really been in a bit of a bind on Rogue One, supposedly. Apparently, he only had 4 weeks to score the entire film after Alexandre Desplat dropped out, which is pretty crazy.
It seems to be shaping up quite well though, with Star Wars revealing this first listen to the soundtrack. This video shows off the film's score being recorded live, and we get a very brief listen to two songs. This sounds pretty much what you'd expect from a Giacchino Star Wars movie, and that is a great thing.
Take a listen and a watch: