The base version of Street Fighter 6 (not including the Years 1-2 DLC fighters) will also be available on Nintendo Switch 2 as a digital-only release

This was a footnote in the eShop page of the game: https://www.nintendo.com/en-gb/Games/Nintendo-Switch-2-games/Street-Fighter-6-2792834.html

Choose from Street Fighter 6 Years 1-2 Fighter Edition, or the digital version of Street Fighter 6 for Nintendo Switch 2.

Not sure why one would pick the base version unless is really cheaper, but it's an option