In Rogue One we will see new Imperial troopers and that includes the Shoretroopers (also called Scarif Stormtroopers by Hasbro), if you were at Star Wars Celebration Europe in July and went to the RO costume booth, you may have noticed that there were three different type of Shoretroopers. Hasbro Pulse has posted an article explaining the differences between these three.
This is the standard uniform with no additional markings.
Then there is the Captain who has blue markings and a yellow stripping on his left forearm.
And finally there’s the Squad Leader who has blue markings but who doesn’t have an armor skirt and the ammo pouch, instead he has a kama (or belt-capes).