Some manufacturers have been able to "touch" the new Nintendo console, without the possibility of actually seeing it to avoid leaks. There are no concrete dates for its release, but they all agree that it won't release this year, even though the console is ready. This is just a strategic decision to have a better lineup, and they expect this Christmas period to be the last one for Switch, and Switch 2 to release Early 2025.
The information we've managed to get says the console is a bit bigger than the current Switch models, but still smaller than a Steam Deck. Another change is on the joy-con side, which will trade their current attachment system using rails for a magnetic system.