From the GitHub release page:

This is CircuitPython 7.3.0-beta.2, the third published beta release for CircuitPython 7.3.0. It is relatively stable, but there will be further additions and fixes before final release.

Notable changes to 7.3.0 since 7.2.5

• • Experimental mDNS support.
  • USB to to Serial/JTAG support for REPL on appropriate boards.
  • Initial experimental USB host support.
  • Merge MicroPython 1.18 changes.
  • Preliminary zlib module support. gzip module will be added later.
  • RP2040 PIO: Background write to a PIO state machine. Looping is possible.
  • RP2040 PIO: wrap and wrap_target support.
  • keypad: scan keystates immediately on creation.
  • Improve NeoPixel timings on many ports, to handle a wider range of devices.
  • Add floppyio, used in conjunction with a library.
  • Allow TileGrid bitmap to be changed.

  Download from circuitpython.org

  Firmware downloads are available from the downloads page on circuitpython.org. The site makes it easy to select the correct file and language for your board.

  Installation

  To install follow the instructions in the Welcome to CircuitPython! guide. To install the latest libraries, see this page in that guide.

  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).

  Documentation

  Documentation is available in readthedocs.io.

  Port status

  CircuitPython has a number of “ports” that are the core implementations for different microcontroller families. Stability varies on a per-port basis. As of this release, these ports are consider stable:

  • atmel-samd: Microchip SAMD21, SAMx5x
  • cxd56: Sony Spresense
  • espressif: Espressif ESP32-S2
  • nrf: Nordic nRF52840, nRF52833
  • raspberrypi: Raspberry Pi RP2040
  • stm: ST STM32F4 chip family

  These ports are considered alpha and will have bugs and missing functionality:

  • broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
  • espressif: ESP32-S3, ESP32-C3
  • litex: fomu
  • mimxrt10xx: NXP i.MX RT10xxx
  • stm: ST non-STM32F4 chip families

  Changes since 7.3.0-beta.1

  Fixes and enhancements

  • Update frozen modules. #6316, #6293. Thanks @dhalbert and @FoamyGuy.
  • Improve NeoPixel timings. #6312. Thanks @dhalbert.
  • Fix MP3 looping and handle more variations in MP3 file layout. #6305. Thanks @jepler.
  • Remove frozen adafruit_bus_device on boards where it is provided natively. #6298. Thanks @Neradoc.
  • Add settable TileGrid.bitmap. #6270. Thanks @FoamyGuy.
  • Add floppyio. #5852. Thanks @jepler.

  Port and board-specific changes

  Broadcom

  Espressif

  i.MX

  • Fix PWM support. #6287. Thanks @KurtE.
  • Allow setting CPU clock speed. #6279. Thanks @mjs513.
  • Don’t set up debugging serial port when not debugging. #6261. Thanks @KurtE.

  nRF

  RP2040

  • Background writing to a PIO StateMachine, with optional looping. #6300. Thanks @jepler.

  SAMx

  STM

  • Fix time.sleep() misreads of time. #6303. Thanks @DavePutz.

  Individual boards

  • Adafruit ESP32-S2 TFT Feather: fix enabling display. #6272. Thanks @ladyada and @dhalbert.
  • SparkFun SAMD51 MicroMod: fix external flash for latest v1.3 revision of board. Thanks @stonehippo.

  Documentation changes

  • Fix signature of random.randrange(). #6299. Thanks @tekktrik.
  • Add missing documentation for math.log(). #6296. Thanks @tekktrik.
  • Improve documentation for SPI.readinto(). #6294. Thanks @tekktrik.
  • Correct keypad doc errors. #6283. Thanks @Neradoc.
  • Remove broken “Edit on GitHub” link in readthedocs. #5763. Thanks @tekktrik.

  Build and infrastructure changes

  • Remove huffman from requirements-dev.txt; it is in tools/. #6315. Thanks @dhalbert.
  • Fix Windows building. #6266. Thanks @ladyada.

  Translation additions and improvements

  Thanks for translations:

  • @hexthat (Chinese – Pinyin)
  • @urunsiyabend (Turkish)
  • @wtuemura (Portugese – Brazil)

  New boards since 7.3.0-beta.1

  • ELECFREAKS Pico:ed. #6282. Thanks @xuhow.
  • Pimoroni Motor 2400. #6314. Thanks @ZodiusInfuser.
  • PJRC/SpkarFun Teensy MicroMod. #6273, #6265. Thanks @KurtE.
  • Wiznet W5100s-EVB-Pico. #6281. Thanks @ViktorWiz.x

  Known issues

  • See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
    • 7.2.x
    • 7.3.0
    • 7.x.x

  Thanks

  Thank you to all who used, tested, and contributed since 7.3.0-beta.1, including the contributors above, and many others on GitHub and Discord. Join us on the Discord chat to collaborate.