Blizzard is offering an upgrade for those of you planning to purchase the digital version of World of Warcraft: Mists of Pandaria.
Brought to light by MMO Champion, the Deluxe Edition is mentioned on the Battle.net account management page, though no price or contents are revealed.
For what it's worth, the boxed collector's edition of Cataclysm included an art book, behind-the-scenes video, soundtrack, and mouse pad. Maybe the Digital Deluxe Edition for Mists of Pandaria will contain something similar. You can probably expect some sort of in-game content as well – perhaps a mount or a pet.
Mists of Pandaria is expected to launch later this year. The new expansion adds a playable Pandaren race, a new monk class, an entirely new continent, and an increase in level cap to 90.