Originally Posted by artouiros
You will stiil need to buy WoD, some tiem later it may be incldued in battlechest, but for sure not on the next day of Logion.
No,, you dont have to buy it. It is already implemented since 18.05.2016 - you can look it up
You can't even purchase WoD from blizzard. Only the battlechest and legion is available.