fleischr on 25 October 2016
Credit to KingAveryGames on Twitter. Based on estimatimation of 6.2" screen size.
Exact size height of N3DS XL is 9.35 cm or slightly less than 3.7 inches
In the name of science, if someone would please take a hacksaw to the lower, left hand portion of N3DS XL - that will give us a rough approximation of what a Joy-con will really feel like in our hands 
Fun fact: the original Gameboy was even smaller. About 9 cm or 3.5 inches wide. So it would seem if you can still hold a Gameboy comfortably in your hands, the Joy-con should be no big deal, just sayin...
Granted the exact shape and thickness will change where your thumbs rest though...
I predict NX launches in 2017 - not 2016
