Depends on what the next Switch will be.
In case of a "pro" model, I expect
o visual and performance equal to Xb1-S in handheld mode
o performance at or slightly above base PS4 when docked
I case of a next gen Switch, i expect
o performance above base PS4 in handheld mode (cpu in particular)
o performance equal to the Series S in docked mode
o additional hardware inside the dock to bypass the limitations of mobile chipsets. (to make the switch 2 an ACTUAL hybrid)
Nintendo Switch:
... announced as a Home Console
... advertised as a Hybrid
... delivered as a Portable