I’m not sure where they got this, but I found this at http://www.starwarsnewsnet.com/ and it was simply labelled; “Rogue One Planet Jedha”

They look like some form of priests, and they are on the planet Jedha which has been confirmed to be a pilgrimage for believers in the Force, but they look kind of sinister as well as walking alongside an Imperial officer, so doubt that they are good guys. Maybe we will get to see some Dark Side worshipers in RO? I haven’t been paying too much attention to the new canon, but do the general public in the SW universe know that the Empire is being run by a Sith lord?