MobaPad is a Switch controller and game case maker (that I have never heard of), so they should have reliable info. They said that:
- The Switch 2 will have physical cartridges and the slot will also be able to accept Switch 1 games.
- There will be a new button on the back of each Joy-Con, behind the triggers.
- There will be a new button on the right Joy-Con, by the Home button.
You can also do the opposite though. The Switch had 0 backwards compatibility. The GameCube, N64, and SNES had 0 backwards compatibility. Hopefully this article is legit.