GeoServer 2.9-beta is available for download, you can read about it here.
This is a beta release, focused on making our wicket update available for testing, and trying out our release process to ensure we have not broken anything. Beta releases are intended for public feedback and are not recommended for production use.
The big news for GeoServer 2.9-beta is sprint upgrading our user interface from Wicket 1.4 to Wicket 7. We would like to thank sprint sponsors (for what was a labour intensive task):OSGeo, Boundless, Vivid Solutions, How 2 Map, San Jose Water Company, Transient and Geobeyond.possible.
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Jody Garnett