An image on the Nintendo website has fans of both Zelda and the 3DS getting excited. In a list of Zelda games on the website put together for the Zelda 40th Anniversary celebrations, the entry for The Legend of Zelda: A Link Between Worlds has a red graphic that says 'playable with Nintendo Switch Online' underneath it.

Now, obviously everything that follows in this article is conjecture at this point, but I wouldn't be doing my job if I didn't list all of the possibilities.
My first thought is that Nintendo are planning to bring DS and 3DS games to the Nintendo Switch 2 as part of Zelda's 40th Anniversary celebrations. Ok, I love A Link Between Worlds, so this is great news, but surely we would need that dual-screen attachment that we've all seen cropping up in rumours and fan designs over the last year before that was possible. Unless they managed to make a single-screen version, but I'm not really sure how that would go down.
A Link Between Worlds took the 8th spot when we ranked all of the mainline Zelda games and is one of the most unique titles in the series. It allows you to purchase all of the items from the beginning as opposed to finding them in dungeons as you go through the game. It's a game that seriously shouldn't be overlooked, and if it does come to the Switch, then I think a lot of people who are discovering the joy of Zelda through the new Ocarina of Time remake will be pleasantly surprised with how good this game is!

Then there's obviously the option that this could be a huge mistake. A quick look through the other listings shows that there's no red graphic underneath Oracle of Ages, which is clearly available to play on Nintendo Switch Online. This could just be someone who's put a graphic in the wrong place and is currently getting a stern talking-to from Aonuma for getting everyone excited about one of our favourite Zelda games coming to the console when it's not physically possible.
The internet is currently split between being excited that Nintendo might have dropped a little easter Egg for us to find, and disappointed that someone's made an error and got our hopes up. Where do you currently stand? Let us know in the comments below!