From the GitHub release page:
This is CircuitPython 8.0.0-rc.1, a release candidate for 8.0.0. We believe it is stable, and are making a release candidate for further testing before final release.
NOTE: Since 8.0.0-beta.6, the file for specifying startup values for WiFi, etc., is now called settings.toml instead of .env, and uses slightly different syntax. Use double quotes instead of single quotes. Further documentation is here.
WARNING: The flash partitioning for 2MB and 4MB flash ESP32 and ESP32-C3 boards has changed since 8.0.0-beta.2. When you load 8.0.0-beta.3 or later over beta.2 (or vice versa), on these boards, CIRCUITPY will be erased and reformatted.
WARNING: The flash partitioning for the Raspberry Pi Pico W has changed since 8.0.0-beta.1. When you load 8.0.0-beta.2 or later over beta.1 (or vice versa), on the Pico W, CIRCUITPY will be erased and reformatted.
Notable changes to 8.0.0 since 7.3.0
Functionality additions

Add WiFi workflow with browser-based device discovery, filesystem browsing, upload, download, … // Read more: original article.

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