It would be inspired by Paper Mario. You walk into the world and do single player; that immediately solves the single-player lacking of this game; then you could meet players in there and FIGHT or visit a center of Ladders and start queuing there for your regular Constructed or Battlegrounds or Arena as an alternative fun way to queue.
That was an April’s fools joke couple of years ago.
Not sure why it’s a joke. The game is starving for single player content. People often think World of Warcraft is just multiplayer; nothing could be further from the truth; hordes of people buy expansions just so they can play the questing campaigns for a couple of weeks which are 80% of the time just single player modes.