Today KDE released updates for its Workspaces, Applications, and Development Platform.
Significant bugfixes include improvements to the Kontact Suite, bugfixes in Dolphin, Plasma and many more corrections and performance improvements all over the place. KDE's development platform has received a number of updates which affect multiple applications. The changes are listed on Bugzilla. For a detailed list of changes that went into 4.9.2, you can browse the Subversion and Git logs. 4.9.2 also ships a more complete set of translations for many of the 55+ supported languages.
To download source code or packages to install go to the 4.9.2 Info Page. If you would like to find out more about the KDE Workspaces and Applications 4.9, please refer to the 4.9 release notes and earlier versions.