The game comes directly from Nintendo eShop, you will be able to go online, get updates etc.
After setup process the game will be available to launch on your own account, just as any other game or app you purchased directly in Nintendo eShop.
Extend your unforgettable adventure in Hyrule with The Legend of Zelda: Breath of the Wild Expansion Pass. The Expansion Pass grants access to three new treasure chests and two DLC packs.
When you purchase the Expansion Pass, three new treasure chests appear in the game's Great Plateau area. Inside one of these chests, Link will find a shirt bearing a familiar crest: the Nintendo Switch logo! The other two chests provide useful in-game items for Link's adventure.
DLC Pack 1 adds The Trial of the Sword, Master Mode, Hero's Path Mode, the travel medallion, and new armor.
DLC Pack 2 includes The Champions’ Ballad, nine armors you can find while treasure hunting, and an ancient bridle and saddle.