- Better Waydroid integration (Waydroid is the virtual environment that let’s you install and run Android apps)
- A faster and more convenient lock screen
- Halcyon and Folio, the two different interfaces you can choose from, improve blurs, navigation, and settings
And much, much more.
How is looking security wise?
Thats up to mobile Linux distros, mostly dependant on PostmarketOS and how well it supports a specific device. Generally tho mobile Linux has extremely poor security.