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Vaadin 6.4.9 has been published at the download site.
Vaadin 6.4.9 is a maintenance release for the 6.4 branch and the only change is a security fix for a cross site scripting (XSS) vulnerability. See the release notes for more information.
The next release will be Vaadin 6.5.0. You can follow the development of 6.5.0 here. Problem fixes and enhancements planned for upcoming releases can be found from the Vaadin Roadmap in Vaadin Trac.
Get the installation package from the download site at http://vaadin.com/download. If you are using the Vaadin Plugin for Eclipse, upgrade the Vaadin version from the project preferences. If using Maven, the repositories will replicate in a few hours.
As always, when upgrading from an earlier version, you should recompile any custom widget sets and refresh your project in Eclipse. See the General Upgrade Notes for more details on upgrading.