Quick answer: October 16 is a busy day on Switch 2, with Tales of Eternia Remastered, Tenebris Somnia, LEGO Harry Potter Collection and three Resident Evil games.
October 16 is a really busy day for Switch 2. Game Rant counts six games launching on it today: LEGO Harry Potter Collection, Resident Evil 2 Deluxe Edition, Resident Evil 3, Resident Evil 4 Gold Edition, Tales of Eternia Remastered and Tenebris Somnia.
Tales of Eternia Remastered from Bandai Namco is out on both Switch and Switch 2. According to GoNintendo, it lets you swap between the remastered and original graphics and sound effects. It also adds a Boost option to adjust experience gained and how often you get into fights, plus Battle Retry, Quick Recovery, a high-speed mode during auto battles, and an Extreme difficulty from the start. It runs at 60fps on all platforms, and on Switch 2 the resolution goes up to 4K.
Tenebris Somnia is the only brand-new game of the bunch, per Game Rant. It's a horror game that mixes retro-style graphics with live-action cutscenes. LEGO Harry Potter Collection bundles both LEGO Harry Potter games, but Game Rant notes it was already on Switch 1 and there's no upgrade path.