Not long ago, KDE has announced Plasma Mobile, their Linux-based mobile operating system.
But KDE is involved in other interesting projects also. They are working at Fiber, a QML-based browser to provide an alternative for either Rekonq or Konqueror. For now, we only know that it will have support for plugins, a great bookmark tool and the address bar that permits the users to perform Google searches.
For more information, see this article.