User blog comment:LoveWaffle/Quicksilver, Scarlet Witch, and Hulkbuster Concept Art for Avengers 2!/@comment-24751588-20140324220642/@comment-1895174-20140325023706

It may very well be him, but I wouldn't rule out that being a drone or something. Regardless, it gives a decent look at what Ultron may look like in the movie.