The posters feature Iron Man as well as Scarlet Witch, who made her official teaser appearance at the end of Captain America: The Winter Soldier.
The Iron Man artwork is by Ryan Meinerding and the Scarlet Witch is by Andy Park. Both posters are free and available on a first come basis during SDCC Preview Night at the Marvel Booth (#2329). Be sure to keep up on Cinelinx for more Marvel News as it becomes available.
Avengers: Age of Ultron premieres in theaters May 1, 2015.