There was a huge fight about having the ability to fly in World Of Warcraft’s Warlords Of Draenor expansion.
Originally Blizzard said no to the idea on the grounds that they wanted players and the community to explore the world rather than just flying from mission objective to mission objective. Eventually, though the community got so annoyed and up in arms over the issue that Blizzard reversed the choice and added it in patch 6.2.2. However, for players to be able to fly they will need to earn the Draenor Pathfinder achievement in order to fly in the new zones.
Blizzard has even teamed up with WoWHead to create a guide for players to earn the Draenor Pathfinder achievement. After players have completed the achievement, then they will be able to fly across Draenor.
Blizzard has made a comment on why it was taking so long for patch 6.2.2 to be implemented and their reasoning is that they want it to be as smooth of an implementation as possible and that the wait isn’t much longer.