I haven't seen the movie or read spoilers, I'm just putting two and two together, like several others have in this thread. This theory has been mentioned several times
I still think there's hope for the jack-o lantern face, like Ronri said that is definitely Ultimate Ultron's head, just with an added glow. He might sustain damage and glow like that in the movie
Dunno if this theory has been brought up here............But does anyone think in the final fight, maybe in his last moments, Ultron will be battle damaged to the point that what's under his vibranium shell is mangled, leading to the red glow in his body radiating through his still in-tact...
The way I see it, Ultron Prime is like a skinless man walking around with exposed muscle. You can see clear through his body in some areas like the mid-section, and you see every moving part in his face, so it's a much more busy design.
Ultimate Ultron (and no, I don't think they will...