KMix is now ported to KDE Frameworks 5. After a one day long porting effort, the basic functionality of KMix is available: Main Window, Systray, Volume Key Shortcuts, Sound Menu, volume save and restore. More sophisticated parts require more efforts and are currently missing, like the On-Screen-Display (OSD), which requires a port to Plasma 2.
Soundcard hotplug and unplug is also not yet available, as support for this has been dropped from KDE’s Solid libraries. Alex Fiestas explained during the KDE Sprint that it was necessary to reduce complexity in Solid, and that Soundcard hotpluging is not a very widespread usage1. The required code will thus move to KMix in a later porting step.
The part that looks most changed optically is the configuration dialog. In the picture you see some style changes from KDE Frameworks 5.
All other changes can be seen in http://quickgit.kde.org/?p=kmix.git .
1 To avoid confusion: “Not widespread” refers to the number of applications using this feature. Users tend to hotplug their devices obviously frequently.