Espruino (a JS interpreter for MCUs) runs really nicely on this too now - you get wireless programming and debug, and a full Bluetooth LE stack (you can run Web Bluetooth on the device and use to control other consumer electronics).
Any idea which Zigbee isn't mentioned in the press release, when it seems to be available in the new SoC - would it be problematic to make use of it in the micro:bit?
However I bet Nordic's examples for Zigbee on nRF52833 would work pretty much as-is (maybe just changing a few pin names) so you could get up and running pretty quickly.