One thing I don't understand yet: I have the premium edition, but in the descriptions on my backer portal, and on the Fig campaign page, it says the premium edition gains just as much ingame content as the ultimate edition. All extras are supposed to be stuff outside of the game. (Too long, didn't read: shouldn't I also get the Explorer's Pack?) Also see:
"Along with the base game of Pillars of Eternity II: Deadfire, the Premium Fig Edition comes with Digital Guidebook Volume II, Cosmo the Space Pig and Tiny Obsidian Wurm Pets, Eyepatch Hat, Cloak of the Obsidian Order, Obsidian Sword, Official Pillars II Digital Soundtrack, Cooking with Tim Volume I, and PoE Pen and Paper RPG Starter Guide. Added bonuses include St. Drogga's Skull, Beakhead, and Black Flag pre-order items."