The picture is implying an infinite number of interpretations. We take away what we want to take away. At this point, we don't even know if it has anything to do with the movie itself other than a publicity shot to show us what the costume now looks like.
From a certain point of view, that's Star Wars (1977)... ... and Return of the Jedi (1983)... ... and maybe also The Force Awakens (2015) as well. Damn.
...which is another of saying people behind fantasy movies need to try...just try to create an original idea, because the rinse and repeat plotting makes films (so many already creatively challenged in other ways) boring or unbearable.