As others said we have seen a fair bit of coverage already so go do you. If you have some capability for high speed video then maybe some more of that. I would like some detailed measurements of things but I can wait until someone has it there with a micrometer and callipers (between the official stuff and
http://gbatemp.net/threads/gbatemp-nintendo-switch-live-hands-on-coverage.457053/page-3#post-7010398 I am sated for now).
If you have two hours hands on I might consider some more extended testing -- to the best of my knowledge, and certainly for what we did, it was all fairly short bursts. Holding it for hours in one hand/with one hand dominating could be something worth hearing about.
I guess I would not mind seeing some more of the menu but if it is a choice between new game/level/section and that then do that, I kind of want to say even if it is just dance but I won't go that far.
Maybe try to "break" the controllers -- I played that safe cracking game and it was quite nice actually, however I failed in my mission and neglected to wave it around like I was playing the drums or something to see how it responded.