JCE 2.5.2 has been released. This update fixes a few bugs reported since the release of 2.5.1. In addition, the Microdata attributes "itemscope, itemtype, itemid, itemprop, itemref" are now available as standard attributes on all elements without the need to install the Microdata add-on, eg:
Bug Fixes
A full list of fixes are listed in the Changelog
Download and Installation
Instructions for installing and updating JCE for each Joomla version are available here
JCE can also be updated from previous versions using the JCE Updater in Joomla! 1.5 and 2.5 or using the Joomla! Update Manager in Joomla! 2.5 and 3