It will probably be CGI'd in
Notice that the Mark IV glass case has a hole it. The helmet has also been knocked off.
From the Comic Con trailer description. Last part being what we see in the pre-teaser.
- We open with Iron Man putting on his new suit that he can summon through force of will (I believe this is the Extremis armor, but I don’t want to officially call it that). He has some pieces that don’t want to behave, and they start zipping around the room, smashing into things (Tony included), and he gets slammed with some pieces in his nuts and in his back, with the mask the last piece ready to strike. “I’m not scared of you,” Stark says defiantly to the hovering mask. The mask charges, Tony dose a sweet flip, the mask clicks on, Iron Man sticks the landing, and strikes a bad ass pose. Then the Marvel logo comes up.
So there's the "Extermis" angle.
Iron Man suit parts that can fly to Stark
Probably no biological aspects. Just magnetics