Do you think there'll ever be an Iron Man movie in which the main villain isn't an evil version of Iron Man?
Almost all comic book characters are evil versions of the good guy. Zod, Joker, Red Skull, Doctor Doom, the list goes on. Really it's a continuation of the story - Stark has created an arms race by building the Iron Man armor, so the rest of his story is about the consequences.
Personally I'm really happy to see the Iron Patriot armor. The design started out as a joke but it's now iconic. I think someone up above got it spot on - this is a cleaned up version of the War Machine armor for the American public, and it'll go wrong somehow someway with all sorts of unforeseen consequences. I'm hoping they mention AIM in this movie, maybe with the Mandarin leading it like a Marvel version of Dr No.