I think the general sentiment is something akin to the DS -> 3DS transition - no changes to the core design (clamshell dual screen), but improvements in other areas like the addition of the circle pad, glassless 3D, proper OS with a HOME button, etc., and of course the power increase.
Similarly, the Switch 2 would not change the core design (hybrid console with dettachable controllers and a dock), but has additions on top of it, which has been discussed to length here what those could be, and of course, the power increase. The recent discussion of magnets and the screen upgrade are examples of these "additions" I'm talking about, which the leak in question corroborates.
And IMO, that is a very smart move by Nintendo; they struck gold with the hybrid concept, which was very well accepted by the gaming community and casuals, found themselves in a very favorable position by partnering with Nvidia, who were scrambling for demand of their mobile chips, and arguably pioneered the handheld PC market we have today, so they can refer to all the solutions and ideas iterated by it since the Switch's launch to help design the new console.