Mailing the story:

Roughly half a year and over a thousand commits after the first stable release, the KDevelop hackers are proud and happy to announce the release of KDevelop 4.1, the first of hopefully many feature releases. As with the previous bugfix releases, we also make available updated versions of the KDevelop PHP plugins. KDevelop 4.1 is more stable and polished than 4.0; we suggest everyone should update to this new version.