I can't be sure and anyone who read the comic book knows the Extremis transformation merged part of the armor with Tony's body. Are we seeing this in the tv spots? This seems to be a modular assembly and not a biomechanical interaction. The armor "working at the speed of thought" aspect so crucial to the Extremis story could be on display or it could be something else.
This reflects a bigger ideological question. Will the audience want to see Tony Stark become part machine? The danger posed by science changing our bodies is a major theme in science fiction today. Will this anxiety inform Iron Man 3 or will The Mandarin as Bin Laden be enough?
If the goal was to make me (and you) curious, Marvel Studios is doing exactly what it needs to do. I'm sure there is more hype heading our way.