Details are sparse at the moment, but apparently Wal-Mart will be selling tickets for an advance screening of the Man of Steel beginning May 18th at local stores.
The Superman Man of Steel Fan Facebook shared the following:
"ADVANCED TICKET SALES! For what is the arguably "the most highly anticipated Hollywood blockbuster of the year", Wal-mart will be the location for advanced ticket sales beginning May 18, 2013 8AM (in your respective time zone,) for an EARLY screening of Man of Steel on June 13, 2013 at 7PM! Tickets will be for 2D and 3D, depending on the theaters in your area. Wal-mart stores are still in the process of receiving the promotional info, but confirmation did come today from 3 different stores throughout the day. You can expect to hear more soon."