From the LA Times, here's the first official look at Anthony Hopkins and Tom Hiddleston in-costume for their respective roles as Odin and Loki. As you can see, director Kenneth Branagh has spared no expense in getting old Krull sets and covering them in Sears Portrait Studio backdrop texture. What a world.
Also, the accompanying article confirms both Thor and Captain America are of course going to be made 3-D in post-production. So, if you decide not to pay the extra to see the muddy conversion, expect to be confused why our greatest patriot keeps heaving his shield RIGHT AT THE CAMERA.