Nintendo Switch 2: The Confirmed Details So Far

Nintendo's Switch 2 is the company's first true successor to the original Switch's hybrid handheld/docked concept, and Nintendo has been unusually direct about a handful of core details ahead of launch.
Backward compatibility is the headline commitment: the vast majority of existing Switch cartridge and digital titles run on Switch 2, removing the library-loss concern that has hurt past console transitions (the Wii U to Switch jump being the most recent painful example for Nintendo specifically). Existing Joy-Con and Pro Controller peripherals from the original Switch, however, are not compatible with the new console's different connector and magnetic attachment system.
The screen grew noticeably larger while keeping the same handheld-first philosophy, and Nintendo has confirmed improved resolution output when docked, targeting sharper image quality on a TV than the original Switch's docked mode, which was frequently criticized for looking soft compared to competing consoles even in its later years.
Nintendo has been consistent in messaging that Switch 2 is additive rather than a hard replacement in the immediate term — new first-party titles are being built for Switch 2, but the original Switch's enormous existing library and lower price point mean Nintendo expects both consoles to coexist in its lineup for some time, similar to how the 3DS and Switch briefly overlapped.
For anyone deciding whether to wait: the backward-compatibility promise means an original Switch library purchase isn't wasted money regardless of when you eventually move to Switch 2.