This rumored new Switch version, is very tricky to guess. I particularly think that, since Switch is attracting a lot of developer a more powerful version of the console , or at least one "expansion pack", like a dock that adds storage, processor and so would be nice, and this will improve performance in several games right away, but, this leads to another problem that, developers will need to have the game running in 3 setups, handheld, "dock, vanilla version" and " Pro". And this scenario might cause to have games running with horrible resolution on handheld, so so on dock and good on the pro. This might cause more problems that solutions, mainly if we consider, at least I believe, that people play more in Handheld mode and have the Switch as a secondary console, to complement the PC or PS4, XOne,
And based on that, since people always complaint about Switch price point, and a lot of people say that just will buy the console if is cheaper and or that Nintendo must cut the price, A handheld only could make ore sense. And if they improve battery life. But the issue here is how the will handle the joycons, because "fixed controls" will kill the ideia of "sharing the joy".
I particularly believe that, the two options I mentioned are feasible and may have an audience for both, but how they will do that, without pissing who already bought the console is the interesting part to watch. And seen how Nintendo Handled their hardware revision, I rather have may expectations low, this might be a New 3DS Switch , rather than a Xone X or PS4 Pro Situation,
BUT, one thing they need to do is improve storage, 32GB is awful, and network. This might no be related to the hardware per si, but now that they are charging for the "right" to play online, they need to improve their infrastructure.