Dating back to the GameCube, Nintendo seems to have moved on from cartridges and gone with the disc. But we did learn that the Switch will use cartridges, which is interesting. However, Nintendo has yet to show what they actually look like.
Last night on Twitter, @CraigSkitz posted a photo of himself holding the The Legend of Zelda: Breath of the Wild game card. The game card is similar to the 3DS and PS Vita cartridges. A picture of the game card is posted below: