Co-director Joe Russo mentions it while attending a signing in Hollywood.
The Avengers 2 Comic-Con Video Interviews: Russo Bros., Chris Evans, Mark Ruffalo and Chris Hemsworth
Four more from the SDCC.
Waiting to see the reception for Captain America 2.
Joins London, Paris, Beijing and Los Angeles.
Joe Russo talks Cap 2 and compares it to a '70s thriller.
Plot being developed and Feige returning to produce.