Made by Drew Struzan, it looks like it pretty much embodies and keeps with the spirit of the old posters. I like it!

USA Today has an article about the upcoming film, and it reveals some plot points:

• Indiana Jones has aged in “real time”, 19 years since Last Crusade, so this film takes place in 1957, during the cold war.
• Locations visited include New Mexico, Connecticut, Mexico City and the jungles of Peru.
• Nazis are not the main “bad guy”. He’s trying to find the skull before agents for the Soviet Union do. Cate Blanchett plays one of these agents.