Item 47 is a Marvel "one-shot," to be included on The Avengers Blu-ray. For the uninitiated, "one-shots" are short DVD-only films tangentially related to the feature they accompany. Check out the first clip from Item 47:
The short stars Lizzy Caplan and Jesse Bradford as a down-on-their-luck couple who happen across an alien gun after the events of The Avengers. Faced with the powerful weapon, they decide to go on a string of robberies.
Item 47 is the third one-shot from Marvel, after The Consultant, which accompanied the Thor Blu-ray, and A Funny Thing Happened on the Way to Thor's Hammer, included on the Captain America: The First Avenger Blu-ray.
You can own The Avengers along with Item 47 on DVD and Blu-ray beginning September 25.