It has been a ongoing debate on whether or not the Extremis Armor will featured in any of the Iron Man films, specifically Iron Man 2. Personally, I have a strong belief that it will be featured in the film or be referenced in some form. I came to this conclusion because of the different pics that have been shown featuring an armor very similar to the extremis armor.
This pic
and this one
The similarities are to the Extremis armor are obvious
Let the debate begin...