According to Super Mario Odyssey’s listing on the Japanese Nintendo eShop, the game takes up 5.7GB of space when downloaded to Nintendo Switch.
The game will support English, Japanese, Spanish, French, German, Italian, Dutch, Russian, and Chinese on all regional versions of the game. So no matter where you pick up your copy from, you can play on any of these languages.
It’s amazing how small Super Mario Odyssey is, especially when compared to other titles such as NBA 2K18. Nintendo has done a really good job with compressing the game.
Super Mario Odyssey launches worldwide on October 27, 2017.