Extremis soldiers can create/breathe fire and Feige did say we'd see more of it. Just throwing that out there.
I actually speculated on that very thing when we got the 6 second version earlier today. That super powered guy at the beginning is starting to look more and more likely as Luke Cage, but I do wonder if he's an Extremis dude. It explains why the building he was in is on fire. If that ends up being the case, I suppose they could throw teleporting into his power list. I'm kind of expecting a paranormal connection to the other flame scene, though. It might just be the low quality I'm getting on the stream, but at times I keep thinking I'm seeing a red cloak and, possibly, some skull imagery.