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 Smash or Super Mario Bros. Wonder aren't going to go past 1080p60 without some kind of update to go past those numbers. For games with a more checkered approach to resolution and/or framerate, however, the extra power on the new system can be put to use to put those on the upper boundaries more frequently and consistently, so games like Bayonetta 3 or Xenoblade 2 would be running and looking a lot better by default without needing to be updated by the developer.
They also suggested that any update to games to get them past those bounds are being encouraged to be worked on as new releases by Nintendo themselves, but there were no solid details about the hows and wheres of that because I don't think they genuinely knew what the path forward was for those, other than mentioning that they really hope that the eShop gets a huge overhaul to make visibility on what's Switch 1 or Switch 2 easy to understand as the current eShop design is pretty lacking for extended view options. I have to imagine that Nintendo will offer both bespoke SKUs as well as upgrade paths for existing owners, as they're not strangers to that, but I do think that regardless, something like that 4K60 version of BOTW is not going to be a simple and free update just for sticking your game card into your new system.
They also suggested that any update to games to get them past those bounds are being encouraged to be worked on as new releases by Nintendo themselves, but there were no solid details about the hows and wheres of that because I don't think they genuinely knew what the path forward was for those, other than mentioning that they really hope that the eShop gets a huge overhaul to make visibility on what's Switch 1 or Switch 2 easy to understand as the current eShop design is pretty lacking for extended view options. I have to imagine that Nintendo will offer both bespoke SKUs as well as upgrade paths for existing owners, as they're not strangers to that, but I do think that regardless, something like that 4K60 version of BOTW is not going to be a simple and free update just for sticking your game card into your new system.