This page details work on Printing in KDE.
KDE4 uses the Qt printing infrastructure for the application side and system-config-printer for the Print System Configuration.
The primary plan is to use Qt OpenGov to push our required features into Qt5. This may require an interim fork for KDE4 as it may take up to 2 years for KDE5 to emerge with the new printing features enabled.
The old printing.kde.org website had some useful general information on CUPS which are reproduced below. This may eventually be transferred to TechBase or UserBase if deemed useful.
Old information about KDEPrint3 transferred from TechBase and printing.kde.org.