Disney blogger/investor StitchKingdom says that the imagery 'evoked concept art of a video game' and it 'screamed Halo to me.'.The art showed 4-5 armored, soldier-like persons on the ground, 'with two to three ships in the background.'.The concept art was a gritty 'dark/gray image': 'very dark and done in greens, so it evoked the idea that it was being done under the cloak of night.'.
Here is what I have learned about the Star Wars Rogue One concept art shown at the event:
