First unit is finally shooting in Italy for Avengers: Age of Ultron, as we get our first glimpses of the actors in costume. The high volume of photos are making the rounds Twitter and blogs-alike (JustJared). We see Jeremy Renner as Hawkeye (sans SHIELD patch) along with our first looks at Elizabeth Olsen as Scarlet Witch and Aaron Johnson as Quicksilver.
A stand-in for Ultron or his horde of bots also showed-up on set, but isn't a great representing the final look of the deadly robots. Since they're CGI characters and won't actually be shown in-camera with actors during set shoots. The Italian set is actually doubling for a Eastern European country, likely Serbia or the fictional country Transia.