True, understood, and I have. Point being that even though it's BASED on the Extremis story, doesn't mean that it has to actually involve the Extremis compound and its effects. The movies have already taken plenty of liberties with the character and technologies from the comics, and we won't know for a while yet that Tony will at some point dose himself with the stuff instead of (as is closer to the comics personality) invent his way out of a situation.
I understand that, though given the plot of the film, I'm disappointed that we aren't getting the AWESOME transhuman discussion that makes Extremis a must-read for modern literature. Ellis is great at that stuff.