From official release announcement :
KaOS is very proud to announce the availability of the February release of a new stable ISO. This release brings the end of KDE 4 as the default Desktop Environment for KaOS. Almost ten months ago work started to fully migrate to a Frameworks 5, Plasma 5 based distribution and with the release of Plasma 5.2.1 this migration is now deemed ready to bring a better user experience then KDE 4. From the unset of this migration there was never a plan to mix the two environments. What you will see on this ISO is a pure Plasma 5 based environment.
As many might have noted KDE Applications 14.12 did not contain more then a handful of Plasma 5 applications. KaOS though has been shipping all ported applications from their frameworks branch in the many snapshot ISO it has released to get ready for this migration. Just about all applications that users have become used to seeing in a KDE 4 version are available as a Plasma 5 port. A few though are not ready yet, and those will be missing from the KaOS repositories until their ports are ready for daily use. An example is the application Skrooge, users are advised to use the fully ported Kmymoney until Skrooge can return back to the repositories.
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