As I previously announced on the new for the pre-order of Warlords of Draenor, both editions will give you one Level 90 Character Boost but you can also you can also buy  it independently for 60 $ on the Battle.net Shop. Just below you can watch a tutorial that explain to you how to activate your Character Boost after you purchase it.
This fall, the fearless heroes of Azeroth will clash against the mythic might of the Iron Horde when Warlords of Draenor launches worldwide. Prepare for the coming invasion now by immediately boosting a character to level 90 with your pre-purchase of the expansion digitally.
Interested in boosting more than one character to level 90 right away? In addition to the instant boost you get with your Warlords of Draenor pre-purchase, you also have the option of buying additional character boosts directly through the Shop in-game.