Watching the special "Behind the Skull" feature if you hit the 9:01 mark there are a bunch of Marvel concept arts from Captain America to Sliver Surfer, but there is one particular concept art of a superhero that was blurred out on the wall.
Who is that?
Character from an upcoming Marvel film, maybe Avengers?
He is definitely a superhero though.
The one-shot "Funny thing happened on the way to Thor's Hammer" is (how do you say it...) Boss.
Someone on that forum mentioned it maybe Quasar
or even Captain Marvel
I see it!