I think they’re different IR sensors as these seem to be located on the side rather than the bottom so anything that relied on the current gen ones will either need an update for the new orientation or won’t work - eg labo where the joycon placement within the cardboard simply won’t work if the sensor isn’t at the bottom. That said there are only a tiny fraction of games that rely on it so I think it’s a fair enough sacrifice.Ah sorry I mean almost all games will be compatible out of the big ones! I think the ones that wont be will be more obscure titles.
Nintendo aren't know for giving anything away for free, so any game with improved performance I'd bet money on them charging for.
I'm interested to see the line up of launch games. They've spent years getting ready for this and should have a steady stream of great games for the next couple of years. I hope for their sake the big launch title isn't a Luigi one
I doubt anything that isn’t physically ruled out like that won’t be backwards compatible - like the 3DS could play all DS games except those with controllers or accessories that needed the GBA slot.