From the GitHub release page:
4.0.0 is the latest major revision of CircuitPython and features support for the nRF52840 BLE chipset, display support and translated messages.
This is the first alpha release of 4.0.0. Alpha releases do not have the complete API from 3.x on the nRF builds and are only meant for testing. (Beta release will have the full existing API but still need work.) Please use the latest stable release when first starting with CircuitPython. It is stable.
Try the latest version of the Mu editor for creating and editing your CircuitPython programs and for easy access to the CircuitPython serial connection (the REPL).
Most builds are available as both UF2 and bin files here along with test builds.
- nrf: Adds nrf52840 USB support. Thanks @hathach, @arturo182, @dhalbert and @jerryneedell.
- Adds translated messages for German (de_DE), French(fr), Spanish (es) and Tagalog (fil). English is available as en_US. Thanks to @turbinenreiter, @arofarn, Pierrick C, @C47D, @eighthree, and @tannewt.
- atmel-samd: Adds support for Grand Central M4 Express, Hallowing M0 Express and Trellis M4.
displayioto manage displays. Thanks to @tannewt, @jedgarpark, @ladyada and @dhalbert.
- Adds dynamic VM memory management by changing stack size with
supervisor.set_next_stack_limit. Thanks to @tannewt and @dhalbert.
None so far.
Thank you to all who used, tested, contributed, helped out, and participated on GitHub and/or Discord:
@ladyada, @dhalbert, @tannewt, @kattni, @microbuilder, @arturo182, @tralamazza, @hathach, @glennrub, @siddacious, @deshipu, @sommersoft, @jerryneedell, @brentru, @caternuson, @dfarning, @jepler, @PaulKierstead, @notro, @Jahor, @Makdaam, @mrmcwethy and surely more we have missed. Join us on the Discord chat to collaborate.
Documentation is available in readthedocs.io.
Here are all the changes since 3.0.2.