This new release includes a new Scenario interpreter that have a BDD style, XWiki integration (use XWiki to write your executable specifications), a plugin for Grails, a better compatibility with Confluence 3.0 and up, many improvements to the PHP extensions (Thanks to folks at Astria) and bug fixes.
See the release notes for more details…

[...] This post was mentioned on Twitter by Vincent Massol, Freddy Mallet. Freddy Mallet said: GreenPepper 2.6 now available with an XWiki integration and a Grails plugin. http://bit.ly/6z5bOU [...]