Animal Crossing: New Horizons, the former of which is an expanded remaster of a Nintendo Wii U game.
There are several Nintendo Switch games that have been announced but don't have release dates outside of "2020", including Bravely Default II, No More Heroes III, and Xenoblade Chronicles: Definitive Edition, but there is no guarantee that these games won't be pushed back until 2021.
There are a couple of games that have been announced for the Nintendo Switch that we still don't know a great deal about. Pokémon Sword & Shield have sold extremely well, yet it's too soon for Game Freak to announce the next games in the series. What is likely to be announced in 2020 is a sequel to the Pokémon: Let's Go! games, which would be set in the Johto region.
The Nintendo Switch has been receiving a steady influx of improved Nintendo Wii U ports throughout its lifespan and 2020 will likely be no different. The HD remasters of The Legend of Zelda: The Wind Waker and The Legend of Zelda: Twilight Princess seem almost guaranteed to come to the Nintendo Switch at some point. Pikmin 3 is another strong candidate, especially if the rumors of Pikmin 4 still being in active development are true. A port of Metroid Prime Trilogy, as well as less reputable rumors about a remake of Super Metroid.
The Nintendo Switch Online library will likely keep expanding, but it's unclear which system will be added to the lineup. The Nintendo 64 seems like the obvious next step, but Nintendo might decide to hold off and pad out the library will Game Boy and Game Boy Advance games. It's likely that Nintendo will repeat its move from 2019 and bolster the Nintendo Switch Online library in September, just as all of the annual subscriptions are about to end.
The Nintendo Switch has been incredibly successful for Nintendo, to the point where the company is projecting fifty million Switch sales by March 2020. There are still a lot of questions regarding Nintendo's plans for next year, but it has done a stellar job in 2019 and fans have every reason to be excited going into 2020.
