With an ARM Cortex-M7 running at 600 MHz, this thing ought to kick some serious butt. 
more info at:
and
https://www.pjrc.com/store/teensy40.html
Not bad for 20 USD.
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It would be interesting to port EmonLibCM to this device. Has the horsepower for (a lot) higher sample rates with 12-bit precision for 16 channels and to calculate several additional metrics in addition to that the AVR lib can’t.
It would indeed!
It’ll also be interesting to see the outcome of the STM32 based OEM device that’s now under development.