Yup.
Switch is probably a custom bin of Nvidia's Shield/Pixel chip. Probably has the A53 cores enabled too, for background download / suspend / update etc. Though these are unlikely to ever be made available to developers, unless background game hosting becomes a thing ....
I'm expecting that Nintendo buy the chips direct from Nvidia and don't fab them themselves; that Nvidia had a hand in designing the main board (they've already been there, done that); that the API is based on Nvidia's existing work for Tegra; that Nintendo basically recognised that buying the processing technology for their platform from Nvidia was better than them half assing something themselves.
Nvidia get to re-use IP they've already spent money on, Nintendo get a ready made architecture and an API that already has a ton of preparatory background work done.
I think there will be no meaningful Nintendo performance enhancements at the chip level: there is no edram; no secret large pool of esram; no magic 2 x 64-bit LPDDR4 chips; no Denver cores being switched in for final hardware without developers being informed because (reasons).
It's almost certain we know what Switch is now. And it's a fine piece of gaming kit.
nintendo made the best moves they could by focusing on the market where they are still relevant, at the same time making something for there small dwindling home console market. they know the market has changed and competing with sony/Microsoft won't get them any where, the switch is a great portable console, the only problem is, it should be 250$.