Tony has never had an arc reactor in his chest in the comics. Yes he used to wear a vest that keep the shrapnel from killing him, that also powered the armor for a while, but that disappeared years ago. The reactor is now just built into all of the armor. This explains how the mk42 armour looses power after it crashes, but Tony gets out and he is fine.
The removal of the arc reactor, when put into consideration that he has solved the extremis problem (in order to remove it from Pepper) and his starting to use sub-dermal technologies all points to extremis being utilised by Iron man next movie. In that his statement that he is Iron Man at the end of the film could possibly be a pointer to him having Iron Man 'in' him and that more than just the arc reactor removed at the end of the movie happened in that surgery.
I do wish they had given Pepper an arc reactor though, rather than extremis, could have been achieved as a result of the attack on the house. Would have loved to see Rescue as well.
The removal of the arc reactor, when put into consideration that he has solved the extremis problem (in order to remove it from Pepper) and his starting to use sub-dermal technologies all points to extremis being utilised by Iron man next movie. In that his statement that he is Iron Man at the end of the film could possibly be a pointer to him having Iron Man 'in' him and that more than just the arc reactor removed at the end of the movie happened in that surgery.
I do wish they had given Pepper an arc reactor though, rather than extremis, could have been achieved as a result of the attack on the house. Would have loved to see Rescue as well.