There are rumors of who and what the man in the Iron Patriot costume is, because Sony holds the rights to that character. Osborn designed the suit, but he is a Spider-Man villain. Pictures show James Badge Dale in the suit, who plays Eric Savin. What I wasn't aware of until reading the linked article (Thank you Superherohype) is that Savin eventually becomes the cyborg villain known as Coldblood; it's possible the Iron Patriot and Coldblood have been merged to avoid infringement. I don't believe the suit is acting on its own when it grabs Pepper Potts out of Stark's bed; I also don't believe Rhodey would do that unless mind-controlled or something...
My current conclusion is either something Mandarin-involved is going to happen to Rhodey, it's Stark's nightmare, or we're going to see Coldblood/Iron Patriot. It's not 100% clear. One thing to keep in mind is that eventually there are going to be tie-ins within the movie to the upcoming Avengers sequel.
Also of note is Ben Kingsley looking a lot better than I expected as the Mandarin, complete with a snippet of his rings, and a Tony Stark troubled by the events in the Avengers, worrying incessantly about Potts' safety.
So far so good.