I noticed while playing through League of Explorers that the tickets on each wing appear to have a date stamp on the edge.
- Template of Orsis - March 22 2013
- Uldaman - March 11 2014
- The Ruined City - December 15 2014
- Hall of Explorers - April 14 2015
Assuming these numbers are intended as dates, is there anything special about these dates that they would be chosen for each wing?