Kdenlive's leader, Jean-Baptiste Mardelle, hadn't been heard from in months, the Kdenlive Git repository hadn't seen new work in months, and overall things weren't looking good for this open-source non-linear video editor.
In a new mailing list post by Vincent Pinon, he says he managed to find Jean-Baptiste Mardelle's phone number and contacted the longtime KDE developer. Mardelle took a break over the summer but then lost motivation in Kdenlive after facting the ongoing code refactoring as being a huge task. Vincent explained, "We agree that Till's redesign is very elegant and powerful, but there are so many things to redo almost from scratch just to get the 'old' functionalities..."
After talking with Jean-Baptiste, Vincent has called upon individual developers interested in Kdenlive to come forward and claim responsibility for new work within the project. Among the actions called for is putting the Git master code-base back in order, ensuring the code is in good quality, provide new communication about the project, integrate new features like GPU-powered effects and a Qt5 port, and progressively integrate the new Kdenlive design.
For the larger items like a Qt5 port and GPU power effects, they are not likely to come until late 2014 or early 2015 if developers do commit to doing the work given the monumental tasks at hand.
More details on the update of Kdenlive can be found via this mailing list thread.