Universal Nintendo': Switch 2 will feature physical and digital backwards capability, devs have access to enhance Switch 1 games Rumor - Nintendo, Page 2

For the record, NateDrake and John Linnenman from Digital Foundry had mentioned that BC is likely to be a bit more vanilla than this write-up suggests, in that it's not going to natively do anything for games that go past their current bounds, so games that are virtually flawless already like

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