Well, crunching my numbers, assuming ~10-15W TDP for the full SoC (on the upper end of what would be feasible given battery life, but Emily Rogers did say battery life was poor), you'd be looking at:
If it's 2 Pascal SMs, clock speed around 1.5GHz and around 750 Gflops FP32 / 1500 Gflops FP16
If it's 3 Pascal SMs, clock speed around 1.3GHz and around 1 Tflop FP32 / 2 Tflop FP16
If it's 4 Pascal SMs, clock speed around 1.2GHz and around 1.2 Tflop FP32 / 2.4 Tflop FP16
Plus a pretty beastly CPU.
Even the first would stomp on any smartphone GPU and in theory be capable of close to PS4 visuals at 720p. That has me suspicious, though, as all the reliable sources have been saying it doesn't compete in power with PS4/XBO, and the above aren't that far off. Potentially I'm massively overestimating the TDP they're hitting, or perhaps there is a docked mode where the clock speeds increase and the fan turns on, and whichever dev has been leaking details simply hasn't been made aware of it yet, with their hardware running at portable clocks.
Honestly I don't know what to think anymore. I'm going to go curl up in a ball in the corner of the room and rock gently back and forth for a while.