The H.265 codec / High Efficiency Video Coding (HEVC) has been approved since January by the International Telecommunication Union. In that time, we have seen x265 emerge as an open-source H.265 encoder similar in nature to x264 / H.264 while now another project is libde265.
The libde265 H.265 codec implementation at the moment is written from scratch and currently can decode intra-frames while inter-frame decoding and encoding support is still a work-in-progress. This library also shows with dec265 as a simple player for raw H.265 bitstreams and then sherlock265 as a Qt-based video player with some other features for playing H.265 content.
This new H.265 project was already brought up within the forums and more information on the upstream project can be found at GitHub. This H.265 library is licensed under the LGPL.