I’m guessing it will be backwards compatible. The Wii, Wii U, DS, and 3DS all had backwards compatibility, and the only reason the Switch didn’t is because it has a vastly different architecture from the Wii U (and no space for a disk drive). I can’t imagine that the Switch 2’s architecture will be vastly different from the Switch, and they’ll both presumably use cartridges, so I’d say there’s a very good chance of backwards compatibility.
I’m guessing it will be backwards compatible. The Wii, Wii U, DS, and 3DS all had backwards compatibility, and the only reason the Switch didn’t is because it has a vastly different architecture from the Wii U (and no space for a disk drive). I can’t imagine that the Switch 2’s architecture will be vastly different from the Switch, and they’ll both presumably use cartridges, so I’d say there’s a very good chance of backwards compatibility.