zhoun,
This release was not planned. This release was made with a few bug fixes to make sure some of our users would not run into issue. Here is the list of fixes released in the 6.5.1 release:-
* Fixed a problem when deploying Maven projects that rely on other Maven Library projects
* Fixed incorrect soap:address field getting generated in WSDL file for generated web services
* Fixed an issue where reverse-engineering from an Oracle database stopped working
* Fixed an issue where reverse-engineering from a MySQL database didn’t work if no catalog was specified