Hmmmm.. I just thought of something.
I have 2 Switches at home, both sitting kind of behind the TVs.
I buy the Switch 2, and I place it behind the TV too next to the Switch.
Since most of my playtime is on TV, it stays there for days, maybe weeks before I finally take it out the dock. I usually reach and pull out the Switch with a quick look.
Now here's the dilemma:
Since they both look the same, from what we think Switch 2 will look like based on all those mockups, how will I know which one's which? And the same goes for my kids. I don't want to keep pulling out the wrong one first.
In conclusion:
There must be a clear differentiator that makes it super easy for people to quickly tell which is the Switch 2. The size won't be enough since the difference isn't that obvious.
So all I could think of is it's either the dock will have a completely new look that will clearly differentiate it from the Switch's dock, like how you can tell different generation consoles apart from their distinct looks (since the dock is the "home console" part of the system), or the joycons will have a completely different shape and look as well. Or...