A monthly update for KDE 4.10.x branch has been released by KDE Team. They are polishing this branch by releasing KDE 4.10.3 on May 7 2013. The focus is bringing bug fixes and translation updates. It's safe to upgrade to this version if you have been using previous 4.10.2 or even if you used older version of KDE, namely KDE 4.9.
As with last month, the main area that KDE tried to improve is KWin and also PIM suite. See the KDE's Bug Tracker for complete list of bugs that has been fixed on this release.