Plus, it's our best look at the face of the big baddie, Ultron.

Details have been slowly leaking from the Italian set of "Avengers: Age of Ultron." Earlier this week, we got our first IRL looks at Scarlet Witch, Quicksilver and a returning Hawkeye, plus a side view of Ultron's practical stand-in. But now more photos have surfaced of another returning Avenger and a better look at the sequel's villain.

In addition to the trio of Avengers making appearances in the early days of shooting, Iron Man was also spotted by photographers, and he's got a brand new suit of armor.

Oh, and he had sweat pants on.

Tony Stark's new armor doesn't stray that far from the design of the Mark XLII from "Iron Man Three," but fans will notice more red featured in the color scheme, as opposed to gold.

But now the question is who — if anyone — is in the suit. The end of "Iron Man Three" had Tony seemingly leaving the suited life behind him and removing the shrapnel from his heart. It's pretty safe to assume that "Avengers: Age of Ultron" will put Robert Downey Jr. back in the armor, both normal-sized and Hulk-sized.

The more head-on look at the Ultron stand-in is sure to be a point of contention for hardcore fans. The warmly dressed double is clearly wearing a bust that will later be CGI-ed over for the final version of the villain, but his mask may be an indication of what Ultron will eventually look like.

The head is clearly modeled off of Ultron's look from the comic, especially in the metal flanking his head, but the evil robot's mouth is tightly closed, losing the classic jack-o-lantern aesthetic.

Obviously, this is very early in production, and the actual movie version of Ultron could look completely different since everything in the photo will be erased in post. So if you don't want to live in a world where Ultron doesn't have an open mouth, hold off on grabbing your pitchfork for now.

"Avengers: Age of Ultron" opens in theaters on May 1, 2015.