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I think i saw the rust thread on twitter. It was about Ferrous system supporting this board with their course and cli tools.

Probably also with a peripheral access crate (type-safe register definitions) and and HAL integration.

So, there's language support for it, but it'll still be necessary to have driver support, ideally a whole support library in Rust.

Most BLE or WiFi enabled microcontrollers have a binary blob for driving connectivity, or deeply C based code that can be a challenge to integrate idiomatically in Rust.

If those figures are right, that would put this new chip as dramatically better than esp32, right?

Yes, the esp8266 and esp32 are power hogs and run quite warm, which is why you don't see them in battery powered gadgets very often. It'll be interesting to do real world measurements when this chip is available.