Looks Like Mandarin could be a front runner for the next villain - which would be great. I was fine with the armor being used with the bad guys in part two because it was such an ongoing issue in the comics, but I think that is enough and I like the idea of a battle with science VS sorcery as well.
"IRON MAN 3
With a $133.6 Million dollar opening US weekend and a worldwide take of $327.6 Million so far, "Iron Man 3" is assured, but as we look toward the Marvel films already filming, I'll conclude the Iron Man specific coverage with this tidbit from MTV News in which Jon Favreau discusses the third film and mentions the Mandarin"
http://www.comicbookresources.com/?page=article&id=26153
(also has some news about the Thor film, Green Lantern and others)