Battle.net announces that World of Warcraft players who preorder the Warlords of Draenor expansion will get their instant level 90 boost automatically. Here's word on the preorder bonuses:

Warlords of Draenor is available for pre-purchase digitally in standard and Digital Deluxe editions. The Digital Deluxe Edition comes with a cache of in-game goodies for your favorite Blizzard games, including a Dread Raven mount and Dread Hatchling pet to accompany you in World of Warcraft, Grommash Hellscream and Blackhand Battle.net portraits to intimidate your foes with in StarCraft II, and a battle-torn Warsong Pennant to fuel your demon-slaying rage in Diablo III. What’s more, like the instant character boost, these will be available to you immediately upon your pre-purchase of the expansion.*