The summary of the changelog since the 2021.4 release from December 2021 is:
- Visual Refresh - Updated wallpapers and GRUB theme
- Shell Prompt Changes - Visual improvements to improve readability when copying code
- Refreshed Browser Landing Page - Firefox and Chromium homepage has had a makeover to help you access everything Kali you need
- Kali Everything Image - An all-packages-in-one solution now available to download
- Kali-Tweaks Meets SSH - Connect to old SSH servers using legacy SSH protocols and ciphers
- VMware i3 Improvements - Host-guest features properly work now on i3
- Accessibility Features - Speech synthesis is back in the Kali installer
- New Tools - Various new tools added, many from ProjectDiscovery!
More info here.