Given the sort of knowns and unknowns you could speculate within fair reason what to expect here given the story in the last 24 hours. We're working with a system here, a tablet/controller device of sorts that is running some form of a NintendOS that's suspiciously like Android but not, and that is very very capable of good things because of the Tegra chip within.
Given Nintendo likes to go cheap, but not too cheap, and likes to use known easy to grasp and use tech, and given what's on the market now and how they like to stay within a budget you can guess out what we're kind of looking at. At a rough guess here, look no further than the Nvidia Shield Tablet and Console using the T1/X1 processors or potentially the quietly worked upon sequel that should pop up anytime too. The word out there so far that is solid is that the device is stupid easy to code for, that people who know Android or make Android games can literally pop and drop a game off that and have it running relatively well on this NX device with nearly no effort and just mild tweaking to get things kosher *plus meeting Nintendo Tech Standards too.* If this mock up is correct I think we'd be looking at the potency of either of the existing Shield devices power considering Nvidia is developing it with them, why not use what's already R&D'd and cheap to export to another device? NIntendo can then still safely lie and say it doesn't run Android, as much as Amazon will say theirs doesn't because it runs FireOS (hmm NintendOS??) seems plausible. Look at what has come out so far that only works on the Shield device such as that 1080p level Doom 3BFG edition with the prior 2 games included that runs at a solid 60fps while the shitty console versions run at half that and get some FPS hiccups (which is tragic.) There are other titles that Shield runs too that are jaw dropping. Also figure this, those games when shoveled over onto Android only run within the 1-2GB space, and only 1-2 games currently in the format reach into the 3-4GB cap...this Nintendo device will if not a lie/rumor handle a 32GB space. LOTS of room for development of bigger things.
It's just something to think about as those are some knowns with the OS leaked by game makers on the back side, then the nvidia info that came out too with some flavor of Tegra if it's the shield tablet/console one or the newer chip., and the rest. That's my take on it at least. Nintendo may be boobs when it comes to consoles but on the portable side they're competent even in a world where tablets and phones are chewing away at their market penetration. This way you'll have a system that can use those games that are eroding their sales base plus have their own stuff to compliment to as well which would be a win-win, especially if that thing gets some basic tablet services (email, browser, netflix-amazon-etc streaming, etc.)
