Featuring a larger screen, an adjustable stand, and bigger, more versatile joy-con controllers, the Switch 2 appears to be an improvement over the original in nearly every single way. Although no game titles have been revealed as of yet, a new Mario Kart entry was shown playing on the screen of the newly-unveiled console in the announcement video that dropped a couple weeks ago. No launch date has been given thus far either, beyond simply 2025 (sometime), but the video did inform viewers of an upcoming Nintendo Direct presentation that is scheduled for April 2nd, so presumably more information will be revealed on that date. Switch lovers start saving up your pennies now, because if history is anything to go by, Nintendo is more likely to launch the Switch 2 in the earlier part of the year, rather than the latter.
That's all the info we've got at the moment. Here's a link to Nintendo's dedicated website page for the upcoming console. You can also jump past the break to see the Switch 2 announcement video (if you haven't already).