Alright, so based on my calculations, if the chip is based on a Pascal-Tegra and the console uses 20W like the Shield TV while the handheld focuses on super low power, we should see a 150-200GFLOP handheld and a 700-750GFLOP console. By my calculations comparing AMD and Nvidia, that makes the handheld a good 20% or so faster than Wii U, but the console 10-15% slower than Xbone in the best case. This all matches what we've heard. If Nintendo were to bump up the console's power consumption to 30W, it would compete with or even beat PS4. So, performance obviously wasn't even a consideration for Nintendo if they weren't able to match PS4. Still, that sounds like one juicy handheld.
I'm gonna guess that Nintendo won't make the NX console use less power than the Wii U. Wii U gobbles up 32W. No telling how that all factors into the different components.
But I'd bet they'll hit at least 30W. Even if they went to 40 or 50, they'd still be considerably under the competition.