Quoting their changelog:
Camera
- General improvements for system stability and performance in certain conditions (Pixel 8 Pro and Pixel 8)
Display & Graphics
- Fix for display getting corrupted in certain conditions (Pixel 8 Pro and Pixel 8)
- Fix for issue with outer display in certain conditions (Pixel Fold)
Framework
- Fix for stability or performance with certain third party apps (Pixel 5a (5G), Pixel 6, Pixel 6 Pro, Pixel 6a, Pixel 7, Pixel 7 Pro, Pixel 7a, Pixel Fold, Pixel 8 and Pixel 8 Pro)
Wi-Fi
- General improvements for Wi-Fi stability and performance in certain conditions (Pixel 8 Pro and Pixel 8)
They also fixed a few CVEs (including one critical): https://source.android.com/docs/security/bulletin/2024-02-01
Seems alright so far. Battery is good.