1. Does it exist
Yes
2. When will it launch
Either Summer 2021 or September 2021 with a ~1 month gap between announcement and release.
3. Launch price
$349.99 with the standard Switch and Switch Lite brought down to ~$269.99 and $149.99 respectively. I also expect the standard Switch to be permanently bundled with a game from that point on.
4. Hardware details
New 3DS-level leap in power with DLSS capabilities, making it great at stabilizing frame rates/resolutions in existing games and not looking watered down on 4K televisions while not being so much of a leap in power that it makes standard Switch owners feel screwed.
5. Any other predictions etc.
It will launch alongside Breath of the Wild 2 and I expect most of my predictions on this to be wrong.