It seems like Nintendo are testing hardware already. Which isn't a surprise. RGT has two sources saying there were two hardware variants was tested internally - one late last year and one this February. They were testing the library for backwards compatibility with older hardware.
Interesting takeaway. Could be ready by next year at the earliest. Might be the Pro model or its successor. Nintendo originally intended Switch to launch with Pascal (probably Tegra X2) but did not make the cut and in doing so compromised on audio. Audio going to get bigger emphasis due to more advanced hardware/better capabilities. Also that this upcoming console will most likely have a more customized SoC.
Nintendo couldn't make an agreement with prices with Nvidia regarded Pascal pricing, so they went with Maxwell (X1). Prices not that much different, Nintendo went with the cheaper option (Maxwell) due to cost - profit.
