According to director Joss Whedon, the original cut of the movie was over 3 hours long. There will be about 30 minutes of the excised footage included in the DVD Release, most of which revolves around Steve Rogers (Captain America). Whedon revealed that one of these scenes revealed Steve Rogers’ reunion with Peggy Carter, his love interest from Captain America: The First Avenger.
GODDAMMIT JOSS. STOP SUCKER PUNCHING MY FEELINGS.