Yoshi and the Mysterious Book will sell for $60 in the eShop and will have an MSRP of $70 for the physical cartridge.
An opmist would say that it is $70 game and they are adding a $10 discount for buying it digitally. A pessimist would say that it is a $60 game and there is a $10 fee for the plastic cartridge.



The cartridge will just have a game key on it*, And you still need to download and install it on your system and have Nintendo’s permission to use your switch 2.
(*probably)
Not sure why you are getting down voted when Nintendo told people they will do this for some games.
According to the box photo on the GameStop site, it does not say that it is a key card.
Nintendo has said that, for now, all first party games are games on cart, though not for games that Nintendo is only the publisher/distributor for (see Pokopia).