That battery life comment is very disheartening. Why even make it portable if you can't take it anywhere without it dying on you?
If they put the Pascal Tegra inside, which is reported to be in the final design, that chip is 60% more powerefficient, meaning it will drain the battery much less (as the GPU is typically a big power hog). It also means it will not get as hot as its older counterpart. Meaning it will likely not need to be actively cooled, meaning no fan running off the battery either. So not only does the chip need much less juice, it also doens't need a fan to keep cool which would otherwise again hog the battery. So just by going with a new Tegra, you can improve battery life tremendously.
Currently, the most powerful pure handheld android based machine uses a 10,000mAH battery and it only lasts about 5-6 hours I believe.
Nintendo better be getting a crazy efficient chip or a crazy big battery for the NX for the battery to last.
Battery is my number 1 concern, not raw power, or GPU, or any other stuff.
In that case you'll be glad to hear they'll be supporting the 3DS for another 2 years.
they must have some data that tells them the camera/AR wasn't being used that much
A camera and mic cost pennies. It makes no sense not to include them. They could be used for all types of apps, social apps, puzzle apps (remember the DS games that had you blow in the microphone), AR games (Pokémon Go)...