One thing U.S. viewers will get to see before the overseas patrons is a reported second post-credits sequence.
Superhero Hype has confirmed the scene comes at the end of the credits. There's even an what appears to be a description in their forums - that ties in to some of Tony Stark's (Robert Downey Jr.) dialogue in the film.
The scene shows the six Avengers (an unarmored Tony Stark, Captain America, the non-Hulk'ed out Bruce Banner, Hawkeye, Black Widow and still-in-his-costume Thor) sitting down in a Manhattan restaurant and eating shawarma in a post-victory group dinner. No dialogue is spoken by the heroes; instead, they're too busy eating to chit-chat.
A photo of the scene has leaked online and does confirm the content- the six characters sitting around a table at a smashed up fast food joint munching down on doner kebabs.
This adds to the a mid-credits sequence which sets up the villain for the sequel and was part of the global release for the film.
Chris Evans Chris Hemsworth Scarlett Johansson Samuel L. Jackson Jeremy Renner Mark Ruffalo, Tom Hiddleston, Clark Gregg, Cobie Smulders, Stellan Skarsgård, and Amanda Righetti star in the superhero team up flick.