So, I was just getting off my train at Grand Central Terminal this morning, and saw lights and other equipment being set up for a film that was about to shoot a scene there. I asked several people what the film was. They told me it was "Group Hug." I remembered reading online that that is the code name for The Avengers. One crew member told me that while he could not confirm this, that I was probably.
Now I don't have any pictures to prove this, but what I saw appeared to be Anna toon scene with people running all over the main lobby fleeing for their lives from what was probably a villain attacking them. I saw them do at least 2 takes.