Its clear a pro is coming. Also with the cloud games recently announced and the rumor of switch pro being 4K ready this is what I think we will see.
Switch Pro with Mini LED screen (as rumored), DLSS, 4K output, ergonomic improvments (smaller bezel), better battery life, maybe better cooling. Increase in GPU and CPU clocks and MAYBE some more or faster RAM. Hopefully but probably not an upgrade on storage (but again probably not).
Basically the system will allow games that run at 900-1080P to be upscaled with DLSS to 1440P/4K and play on 4K TVs. Cloud games will also be able to stream and output up to 4K as well. Most games will be able to take advantage of the increase in clocks to smooth out frames and rez, or use DLSS to push the system further.
It won't be a huge leap though so don't expect PS5 games to be running on the system nativly. But something like Smash will be upscaled to 4K (or close enough 4K) while something like the Witcher or DOOM can just get an increase to make it run smoother.
Nintendo will push cloud games as well with the 4K output and probably snag a decent enough "next gen" game maybe something like Cyber Punk or Resi 8.
Pricing is more difficult to figure out, but I think the best would be
349-PRO
249-Switch Dock
149-Switch Lite.
All though I could see
399-Pro
299-Switch Dock
199-Switch Lite
Its still cheaper than X and PS5 if you go for the full versions.
I basically see the Pro as a way for Nintendo to test the waters for DLSS and Cloud gaming without having to make an entire new machine. If it works out then that can be the future, if no none cares than they stick to Mario Kart 8 to sell another 800 million copies on the Switch 2, 3,4,5 and until the sun dies out and all life dies on earth.