There are hints that The Legend of Zelda: Tears of the Kingdom will be the largest first-party Nintendo game on the Switch. A Redditor clocked that the Japanese version of the game comes in at 18.2GB, which is the same size claim the US Nintendo eShop makes. Meanwhile, the UK Nintendo eShop mentions you'll need 18.6GB of storage.
When compared to Breath of the Wild, that takes up around 14.7GB on your system. So, we're expecting a more expansive adventure this time around. The Legend of Zelda: Tears of the Kingdom is coming out on May 12.