Skyrim on Switch has Zelda items in it, and that gave way to Breath of the Wild DLC. Showing off the first pack, which gives the Trial of the Sword, Master Mode, and several helpful additions. The Champion's Ballad is the second, and it was teased. Those four champions are also getting amiibo.
Mario + Rabbids Kingdom Battle was shown again, and Rocket League is coming to Switch with cross-play on other platforms. There's also Nintendo themed items with this version, which launches later in the year.
Super Mario Odyssey has a vocal theme. Completely unexpected. The game itself is looking fantastic. Mario's hat can control certain items and enemies, and the trailer featured a lot of new stuff. It's also got a release date of 27-October.
I'm not talking the Treehouse reveals here, but already it's going strong with a lot of information on Mario Odyssey, and a 2D Metroid game on 3DS. Both games are looking strong, and many more reveals are set to be made during these streams, so if you have any interest look them up when you can. As I said, the Treehouse streams are where the bulk of Nintendo is these days, and it showed with their reveals. Most Spotlight games were 2018, giving those closer to release a larger focus on the stream. Don't forget about the tournaments Nintendo have as well, with ARMS, Splatoon 2, and Pokken Tournament DX.