The day one push for me was if they confirmed physical backwards compatibility and they did, so I will most likely get it. A new Mario Kart would be nice for a launch game, not a particularly great one personally, I need a proper Mario, Zelda, or something else standout adventure wise, but still good to see a new Mario Kart after it being 10 years since they released Mario Kart 8.
Curious what they mean with the BC and "certain" games, as I was trying to think of anything that could end up being unique to the original Switch that wouldn't come over to the Switch 2 and how that might cause a few games to not fully work, but I'm kinda assuming all general Switch features are pretty easily transferrable. The only thing I noticed, is that the Switch doesn't have the IR camera on the bottom of the right joycon anymore and I think a couple things like Labo and 123 Switch used that for games, so that could consider them as games not properly playable on the new Switch and anything else that possibly used it, but I don't think there are many. Almost forgot to add I know there's the pointer on the side now that lets you do the sideways use of the controller on a surface, using it like a mouse is my expectation, but not sure if that would still work the same as it did in those games, but we'll see.
I'm guessing June is the launch timeframe as it was rumored right before this that May/June was the window, but if they are gonna have the full reveal direct in April, May would be really close to launch and a summer release could be a fun one to do.