Nintendo has confirmed a crucial feature for its upcoming Switch successor: backwards compatibility. President Shuntaro Furukawa announced that the Switch 2 will support existing Nintendo Switch games and the Nintendo Switch Online service.
"...we announced that Nintendo Switch software will also be compatible with the successor to Nintendo Switch. The Nintendo Switch Online service will also be available on the next-generation console." - Shuntaro Furukawa
While a formal announcement is still pending, Nintendo maintains its plan to reveal the Switch 2 before the end of the current fiscal year (March 31, 2025).