Indiana Jones 4 Poster Revealed!

From USA Today:
When last we saw Indy, he was riding off into the sunset in 1989's The Last Crusade, set in 1938 near the start of World War II. The new movie, due this spring, is set at the height of the Cold War in 1957, so the character has aged in real time — 19 years.
Indiana Jones co-producer Frank Marshall is authorized to confirm some rumors and detail some of the story, about a quest for South American relics...
The artifact of the title is inspired by real quartz sculptures of disputed origins that are carved in a way that defies the natural structure of the crystal.
"The theory is they are shaped by higher powers or alien powers or came from another world, or an ancient Mayan civilization had the powers," Marshall says.