JCE 2.5.1 has been released to fix a bug where some elements, eg: <em>, <i> were removed if they had no attributes.
JCE 2.5.0 "Stable" has been released. This update includes a number of changes and bug fixes. Thank you to everyone who tested the Beta and Release Candidate versions.
Changes to core file packaging
Three new features have been added in this release:
Form Elements for Custom Styles
It is now possible to create a Custom Style with a form, input, button, fieldset or legend tag.
Total Files and Total File Size limits
You can set the total number of files the File Directory Path (and its subfolders) can contain, as well as the total size of this folder in Editor Profiles -> Editor Parameters -> Filesystem. This restriction is applied when the user uploads a file.
A "Mixed" Doctype option is available in the Editor Global Configuration and is the default setting on new installs. This option sets the HTML schema the editor uses to included HTML4 and HTML5 elements and attributes.
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