I'd be shocked if it doesn't support physical carts, given Nintendo's history with backwards compatibility. And given the rough equivalence of digital games and carts on the Switch, I'm hoping that means digital purchases transfer too - but that would be a first for Nintendo, I think. Fingers crossed!

There isn't a technical reason to change the cartridge format. I don't see why they wouldn't just use the same carts if backwards compatibility is the goal.

I don't game nearly as much anymore but my understanding is that Nintendo may be the last console maker to regularly produce physical games. Newest Xbox doesn't even have an optical disk drive, I believe?

Nintendo also seems to be the least price gouge-y, in terms of lootboxes and microtransactions and other bullshit. Now I wish that didn't come with the tradeoff of them being completely anal when it comes to people posting OSTs online but I guess I'll take it.