Once a week, Nintendo adds new games to their eShop on their devices. eShop is available on Wii U, (though outdated) 3DS, and Switch. This can range from Virtual Console to new games and sometimes even video services like Netflix.
This week, it looks like the only game added was Splatoon 2 Global Testfire. The open-beta can be downloaded today for free. Splatoon 2 releases exclusively for Switch this summer.