I think it's hinted. He said he will work on Extremis so that he can fix Pepper. I don't remember the exact words, but he said something along the lines of "why don't I fix myself too" Maybe it's just to get the shrapnel out, but what about the gaping hole?
It's just my speculation of course, I think so because Extremis is known as a healing factor which should help him, also, a person like Tony Stark, it's hard to imagine him not being selfish and take on one of the most advanced technology for himself after he figured out how to perfect it.