A few vague, but interesting, details mentioned here;
http://www.starwarsnewsnet.com/2016/01/rumor-new-details-on-rogue-one-from-joblo.html
The one of the left might have something to do with the rumour of there being stormtroopers in black armour appearing in the film.
(The article also mentioned some new Tie-fighter designs, which I found kind of weird since this takes place shortly before ANH.)