We know Switch 2 will have backwards compatibility. It seems like such an obvious confirmation from Nintendo, but it's never been a given with video game platforms.
Xbox One, PS5, and Xbox Series X/S have shown us that backwards compatibility can boost games massively. Last-gen games can start to seem like current gen ones. Boosting last-gen games would be a new thing for Nintendo, so it's not a given.
There is a rumor that Nintendo showed a boosted Breath of the Wild on Switch 2 to devs behind closed doors. But again, that's a rumor.
I will be very disappointed if few to any Switch games get a boost on Switch 2. It has to happen.
Lifetime Sales Predictions
Switch: 161 million (was 73 million, then 96 million, then 113 million, then 125 million, then 144 million, then 151 million, then 156 million)
PS5: 115 million (was 105 million) Xbox Series S/X: 40 million (was 60 million, then 67 million, then 57 million. then 48 million)
PS4: 120 mil (was 100 then 130 million, then 122 million) Xbox One: 51 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima