Found these over at CBM, They are supposed to be the first set stills for Avengers: Age of Ultron. They depict,
AVENGERS: AGE OF ULTRON First Set Images Surface
“a crashed car in what is rumored to be a scene with the Hulk, which was filmed in Johannesburg.”
Avengers: Age of Ultron is set to hit theaters on May 1, 2015.