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KDE Applications 4.14 Release Schedule
You can find the release schedule for KDE Applications 4.14 at http://techbase.kde.org/Schedules/KDE4/4.14_Release_Schedule.
This schedule follows the same rhythm as 4.13 since it seems to have worked well. So in roughly 4 month you get some new KDE Application with some new features.
Also remember that 4.14 will be applications and kdelibs only (feature frozen); KDE Workspaces (aka Plasma) will be getting 4.11.x LTS releases until August 2015.
We’re still discussing if 4.14 will be the last Qt4 based release of the KDE Applications and thus become an LTS release or if there will be another release: 4.15.