We might have our first look at Ultron in the following set images for The Avengers 2.
Check out an actor in some sort of robotic suit, which looks to be a cominbation of a motion-capture suit meaning CGI will be added in post-production.
Update #2: Higher-res Ultron images added below.
"The Avengers: Age Of Ultron" hits May 1, 2015 directed by Joss Whedon starring Robert Downey Jr., Chris Evans, Chris Hemsworth, Scarlett Johansson, Mark Ruffalo, Jeremy Renner, Samuel L. Jackson, Elizabeh Olsen as Scarlet Witch, Aaron Taylor-Johnson as Quicksilver with James Spader as Ultron.
Head on over to the Cosmic Book News Avengers movie hub for more.