Of course, of course there is still a year before the release of the film, but one thing I noticed is that the orcs seem to be brown, and as people described what they saw in the trailer at Comic Con 2015, it would seem the orcs ask Gul'dan to open the dark portal. If what I remember of the lore, Orcs drink demon blood, kill everything and ruin Draenor, and in an effort to seek not only food/resources, but also worthy foes and lands to conquer, open the dark portal and pass through and immediately engage with Azeroths residents (so to say). Correct me if im wrong there. Maybe the orcs are brown just for the first few scenes, we have no idea, but it would seem as though they are trying to portrait orcs as being brown.
I wonder to how much degree WoW's lore will be altered to fit the Movie standard. For one Lothar is young. By this time in history hes a bit old, still an awesome hero and fighter, but much older, I would say the same for the other characters.