This interim release before the previoulsy announced 1.5.8 update to follow soon, fixes a number of important issues, some of which have been addressed up to now with various patches posted on the forum.
A full changelog is available here
New Install
For a new install, using the installation package is recommended (See installation instructions). It is not necessary to remove the older version prior to installing, but a clean install is always recommended.
Upgrade
The editor plugin can be upgraded by installing the new version over the old using the Joomla! installer (See installation instructions).
Installation Package
com_jce_157_155_package.zip
Administration Component
com_jce_157.zip
Editor Plugin
plg_jce_155.zip