Some Switch 2 games will be on Game-Key Cards, which don’t come with an actual game on it: > Instead, the game-key card is your ‘key’ to downloading the full game to your system via the internet. After it’s downloaded,

Nintendo can’t get enough of cartridges. Even its digital downloads are turning into “Virtual Game Cards” on the Nintendo Switch. After an April update, each game you own digitally will become its own instance of a title, which means you’ll be able to send your cards to a nearby Switch, a friend’s Switch, or—we expect—the Nintendo Switch 2.

Nintendo accidentally revealed Switch 2 Edition games on its website. We don't know what they are, but we have some guesses.