Huge updates to Pitivi are headed this way for July. 0.13.1 is the frame work that should be identical to the finished build with exceptions to the plug-ins.
Pitivi is powered by the Gstreamer and can work smoothly with any format Gstreamer can handle. Since 2008 Collabora Multimedia has sponcered the ongoing development.
Newest release video can be found on YouTube.
If you want help, support, or just learn more about the project you can find all this and more at pitivi.org.