USA Today reports that the 4-5-minute long webisodes will be directed by Greg Nicotero - special effects producer - and will feature a new group of characters and be titled Cold Storage.
Here's Cold Storage synopsis:
Cold Storage tells the story of a young man, Chase (played by Josh Stewart), trying to reach his sister in the early days of the zombie apocalypse. He finds temporary shelter in a storage facility run by a former employee named B.J. (Roebuck); however, things are not what they appear.