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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
I imagine you can just program it the same way as any nRF52 with the SWD/SCLK pins.
It looks like P00/01 aren't available because there is an on-module low-speed oscillator, which is quite a nice addition (you'd have to build your own firmware to take advantage of that though). DEC2/3 are for the switching power supply, but that's actually not such a big deal and I'd just leave it off.
Just to add though, looking at the price you may find the Raytac MDBT42Q is actually the same price or cheaper - and obviously firmware for it 'just works' :)