Gareth Edwards just seems like a fan of ultra wide formats, Rogue One was shot in a 2.76:1 format before being cropped slightly to 2.39:1 for release.
As much as I love that a lot of movies have been coming out in taller formats, which look great at home on our 16:9 TVs, there’s something special about the wider formats, at least when you see them on a suitably large screen at a proper theatre.