The physical editions of this fall's Warlords of Draenor expansion for World of Warcraft will come with a code that'll allow players to boost a character to level 90. Pre-order a digital edition from Blizzard, and you'll get the boost right away.
The Warlords of Draenor expansion gives players the ability to explore World of Warcraft's past. It's also giving players a look at World of Warcraft's future, one where leveling up a character isn't the hassle/enriching experience it used to be. Yeah, we're getting a new/old world to explore, fresh character models and the ability to reach level 100, but those aren't the aspects of the expansion marketing seems to be focusing on.
Either way, the digital expansion is now available for preorder from Blizzard at $49.99 for the regular edition, $69.99 for the Digital Deluxe pack, which comes with all the things.