From the ChangeLog:
- New single-window UI.
- Performance MX leds show the current battery charge.
- Support the VX Nano mouse.
- Faster and more accurate detection of devices.
- If upower is accessible through DBus, handle suspend/resume.
- Replaced Solaar icons with SVGs.
- Running solaar-cli in parallel with solaar is now less likely to cause issues.
- Bugfixes to saving and applying device settings.
- Properly handle ^C when running in console.