The Digital Deluxe edition includes a digital copy of Reaper of Souls, with a total of five additional character slots primed for all-new heroes (An additional 3 more than the Reaper of Souls Standard Edition). It also contains the following in-game content to aid you in your crusade against death itself:

Spectral Hound Minion & Aesthetic Artifacts

Charge through Sanctuary with your Spectral Hound minion at your side and transmogrify your gear with a trio of ageless helms and a full complement of Malthael-inspired weapons.

Treasure Goblin Pet for World of Warcraft®
The treasure goblin comes and goes through his portals, stopping by to join you on your treasure-hunting expeditions throughout Azeroth.

Crusader Portraits & Decals for StarCraft® II
Bring the fervor of the Zakarum to the far reaches of Koprulu Sector with these Crusader-inspired portraits and decals.