So with the Game Systems panel, it was revealed that Druid's Class Order Halls will be located in the "Dream Grove". In addition to this, we were told the following quote:
"Druids can reach many other natural places in the world very quickly."
Perhaps these natural places are the several portal gates that exist around Azeroth from the world bosses in Vanilla WoW - Duskwood (Twilight Grove), the Hinterlands (Seradane), Feralas (Dream Bough), and Ashenvale (Bough Shadow). You'll be able to walk through the desired portal from the Druid Class Order Hall to reach the desired destination.
Thoughts?