User blog comment:ADour/Official title for Marvel's The Avengers sequel announced!/@comment-1671874-20130721222300/@comment-1895174-20130725162644

Never got that Banner was much of a tech guy. If he was, he probably wouldn't have become the Hulk in the first place.

What if it is JARVIS? He goes HAL 9000 on us, builds himself an Iron Man armor in secret, and tries to kill everyone. It's a way to bring Stark back into the franchise that doesn't completely negate the ending of Iron Man 3.