The image is here courtesy of SuperHeroHype, and it's got the whole team lined up, with Hawkeye, Thor, Captain America, Iron Man, Black Widow, and The Incredible Hulk all doing some low impact cardio.

Promotional images of Hawkeye have frequently shown him wearing those sunglasses, like the Ultimate Marvel iteration of the character, and I just hope that, in the film, he's not the sort of guy who wears sunglasses indoors. Or at night.
Marvel and Harley Davidson have teamed up to promote a feature before, as anyone buying Marvel comic books last summer will have seen the Captain America: The First Avenger ads featuring Cap on his Harley and the copy "Two undeniable forces out to liberate the world," fairly well reeking of imperial hubris.
So in the image we've got the characters played by Jeremy Renner, Chris Hemsworth, Chris Evans, Rober Downey Jr., Scarlett Johansson, and Mark Ruffalo. They'll all be present and accounted for when the film, written and directed by fan favorite Joss Whedon, arrives in theaters on May 4th.
Who's missing? Samuel L. Jackson, who is no doubt out shilling for his trademarked spirits (NSFW due to language):
