That was me.
Actually I don't know if it was someone in this thread or somewhere else, but I think someone observed that in different shots (promo pics, etc) that they're using different colours for the crest? For example it's been shown to have a bit of yellow or gold in some shots, but dark in others.
I imagine they did it as a way to pay homage to the various Superman designs over the years, with black being the background color for Superman's shield in Kingdom Come
. The all-blue background in this banner interests me, though; I wonder if that's intentional or if the artist who made that banner got a little too Photoshop happy.