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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Nintendo is reportedly making a digital-only Switch 2 that is not backwards compatible : r/LeaksAndRumors

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Rumor: Switch 2 to support physical and digital backwards compatibility, games can be enhanced

Nintendo Switch 2 Rumoured to Offer Full Backwards Compatibility for Physical and Digital Games, by Paul Farrelly, ILLUMINATION Gaming, Feb, 2024