Here we go again, haha.
It's like people forgot the massive disappointment in the Wii U Speculation Threads.
I don't think that they were serious.
Realistically, we shouldn't expect too much from this. I think the best case is something like this:
CPU: 4x Cortex A72 @2GH + 4x Cortex A53 @2GHz
GPU:2x Pascal SMs (256 CUDA cores) @700MHz (358 GFLOPS = ~448 GFLOPS) in portable mode and 1.2GHz (614 GFLOPS = ~768 AMD GFLOPS) in docked console mode with active cooling
RAM: 4-6GB LPDDR4 @25-30 GB/s (or 50-60 if Nintendo can add a 128-bit bus somehow), possibly with a 16-32MB eSRAM buffer
In the Nvidia vs. AMD FLOPS, keep in mind that Nvidia's stated FLOPS figure is always a minimum in desktop GPUs due to GPU Boost. Either way, I think that these are reasonable enough.