Anyone thinks that at the end of the movie, it's hinted that not only Tony has surgery to remove the shrapnel, but he has also injected himself with a complete, safer, and maybe perfected Extremis? He stated that he worked on the project so that he can fix Pepper, but being Tony Stark, I wouldn't imagine him bypassing the chance to take on one of the most advanced technology for himself. He has all the variables from Killian and Maya, especially all that makes it wrong and dangerous, being a genius, I think Tony Stark would know how to fix it, to make Extremis better if he's put his mind into doing so. Just a thought.