Old news:

Aug 26, 2013
KDE SC 4.10.5 is in jessie/testing.

Jul 12, 2013
KDE SC 4.10.5 is available in unstable.

Jan 24, 2013
KDE SC 4.9.5 is available in qt-kde.debian.net.

Jul 15, 2012
KDE SC 4.8.4 is in wheezy/testing.

Jun 27, 2012
KDE SC 4.8.4 is now available in unstable and will hopefully hit testing soon.

May 14, 2012
Latest KDE Plasma Workspaces 4.8.3 is partially available from qt-kde mirrors, see this email for further information.

April 7, 2012
Users of Debian testing can also enjoy KDE SC 4.7.4 for quiet a while now.

March 8, 2012
KDE SC 4.7.4 has successfully been uploaded to unstable.
Delete /etc/apt/preferences.d/kde-experimental, if you have used that to install 4.7.4 from experimental.

December 18, 2011
KDE SC 4.7.4 has been uploaded to experimental.

December 07, 2011
KDE SC 4.7.2 has been uploaded to qt-kde.debian.net and experimental.

July 19, 2011
Latest KDE SC 4.6.5 is now available on unstable.

June 09, 2011
KDE SC 4.6.3 release just migrated to testing.

May 27, 2011
KDE SC 4.6.3 was uploaded to unstable. Enjoy!

February 6, 2011
Squeeze was released with KDE 4.4.5. Testing repos will keep KDE 4.4.5 until beginnings of March (see "Onwards with Wheezy", third paragraph).

August 24, 2010
As Squeeze has been frozen, Debian will ship Squeeze with KDE 4.4.5. Unstable repos will have 4.4.5 too until Squeeze release. KDE 4.5.x will be available via other repo some time later.

May 16, 2010
Debian testing users can finally enjoy a release from the KDE Software Compilation 4.4.x series! KDE SC 4.4.3 has found its way to Debian testing.

May 3, 2010
After long months of waiting, Debian unstable users can finally enjoy a release from the KDE Software Compilation 4.4.x series! KDE SC 4.4.3 has found its way to Debian unstable.

April 22, 2010
KDE 4.4.2 is available from experimental.

February 22, 2010
Finally the team decided KDE SC 4.4.0 will not make it to the archive, but 4.4.1 (to be released on the 2nd of March) probably will land in experimental/unstable.

February 17, 2010
KDE 4.4.0 is being worked on but it will take some time until it lands on your Debian mirror.

December 15, 2009
KDE 4.3.4 is fully available in unstable.

September 23, 2009
KOffice 2.0.82 (2.1 2nd beta) is now in experimental.

August 09, 2009
KDE 4.3.0 LiveCD available now.

August 05, 2009
KDE 4.3.0 available in unstable. Enjoy!

May 28, 2009
KOffice 2.0.0 available in experimental.

May 17, 2009
KDE 4 has reached testing. Enjoy!

April 6, 2009
KDE 4 has reached unstable. Enjoy!

April 2, 2009
Read about status of KDE 4 to unstable.

January 27, 2009
KDE 4.2 has been released and is available in experimental. Enjoy!

December 23, 2008
An updated Live CD has been released with KDE 4.2.

November 5, 2008
KDE 4.1.3 has been released and is available in experimental.

September 3, 2008
KDE 4.1.1 has been released and is fully available in experimental. Lenny backports will be available soon.

July 15, 2008
KDE 4.1 RC1 released and available in unstable (kde4libs, kdepimlibs, kdebase-runtime) and experimental (the rest).

August 21, 2008
There are KDE 4.1 backports available for Lenny at http://kde4.debian.net/. Read carefully the instructions in that website before installing them.

July 29, 2008
KDE 4.1 has been released and is available in unstable (kde4libs, kdepimlibs, kdebase-runtime) and experimental (the rest). These packages can be installed on the sid (unstable) and (probably) on Lenny systems (likely with a few packages from unstable). Real Lenny backports will be available later next month.

July 15, 2008
KDE 4.1 RC1 released and available in unstable (kde4libs, kdepimlibs, kdebase-runtime) and experimental (the rest). kdeplasma-addons is stuck in NEW, but should also be available withing the next days.

May 27, 2008
KDE 4.1 beta1 released and available in experimental. kdebase-workspace is stuck in NEW, but should also be available withing the next days.

Mar 10, 2008
KDE 4.0.2 released and available in experimental.
KDE 3.5.9 is also now available in unstable.

Feb 5, 2008
KDE 4.0.1 released and available in experimental.

Jan 19, 2008
Metapackages for KDE 4 uploaded to experimental (have to go through NEW).
Kde4libs and kdepimlibs uploaded to unstable.

Jan 18, 2008
KOffice snapshot of svn revision 757194 (upcoming 1.9.96.0 release) uploaded to experimental.

Jan 17, 2008
Kaider and rsibreak 4.0.0 uploaded to experimental.

Jan 11, 2008
KDE 4.0.0 released and availlable in experimental.

Dec 18, 2007
Kaider 3.97.0 uploaded to experimental (has to go through NEW).
kdebase-workspace 4:3.97.0-2 uploaded to experimental.

Dec 16, 2007
Soprano 1.99~rc2 uploaded to unstable.

Dec 13 - Dec 16, 2007
Debian KDE Team meeting in Extremadura, Spain.

Nov 1, 2007
Published live CD with KDE4 beta4.

Oct 15, 2007
KDE 3.5.8 uploaded to unstable.

May 21, 2007
KDE 3.5.7 uploaded to unstable.

April 20, 2007
KDE 3.5.6 uploaded to unstable.

January 25, 2007
KDE 3.5.6 uploaded to experimental.

December 5, 2006
Bug count now passed 1330. And this page has rss feed.

December 3, 2006
New website launched.

December 1, 2006
KOffice 1.6.1 uploaded to unstable.

May 21, 2007
KDE 3.5.7 uploaded to unstable.

April 20, 2007
KDE 3.5.6 uploaded to unstable.

January 25, 2007
KDE 3.5.6 uploaded to experimental.

December 5, 2006
Bug count now passed 1330. And this page has rss feed.

December 3, 2006
New website launched.

December 1, 2006
KOffice 1.6.1 uploaded to unstable.

May 21, 2007
KDE 3.5.7 uploaded to unstable.

April 20, 2007
KDE 3.5.6 uploaded to unstable.

January 25, 2007
KDE 3.5.6 uploaded to experimental.

December 5, 2006
Bug count now passed 1330. And this page has rss feed.

December 3, 2006
New website launched.

December 1, 2006
KOffice 1.6.1 uploaded to unstable.