Phoronix: KDE's PackageKit-Based Apper Sees New Release
Apper, formerly known as KPackageKit, has been updated to support the latest PackageKit advancements for Linux package management on the KDE desktop...
I use Apper on Arch for automatic updating. Works nicely. I had some troubles when I started using it with polkit permissions, and the documentation for that thing is awful, but apper itself is a really nice cross platform package manager.