This was on their FAQ
What comes with the Physical Imperial Edition?
This limited edition provides the full game, and unlimited access to it for 30 days, along with this exclusive collection: Molag Bal Statue: A 12" statue featuring Molag Bal, Daedric Prince of domination and enslavement. The Improved Emperor's Guide to Tamriel: A 224-page illustrated guide annotated by the Imperial scholar Flaccus Terentius. Physical Map of Tamriel: A 21" x 26" printed map detailing Alliance-controlled zones and the ultimate conquest: Cyrodiil. Steelbook? Packaging: A limited edition Steelbook? decorated in the color of the Imperials.
Exclusive Collection of Digital Content:
Play as an Imperial: Become an Imperial and play in any Alliance. Gain unique bonuses, crafting styles, gear, and more. White Imperial Horse: Summon this Imperial mount and journey through Tamriel with speed. Mudcrab Vanity Pet: Explore Tamriel with a mudcrab pet by the player's side. Rings of Mara: Complete the Ritual of Mara with a friend and receive an experience bonus when they play together. If players pre-order the Physical Imperial Edition for PC/Mac at a participating retailer, they'll also receive five days of early access to the game and the Explorer's Pack.
Do I still get an Explorer’s Pack and early access if I pre-order a Physical Edition?
Yes. If players pre-order a physical edition of The Elder Scrolls Online through a participating retailer, they'll still receive their Explorer's Pack and early access. Players can contact their preferred retailer for details.