For more infos read: http://openelec.tv/news/22-releases/167-beta-openelec-6-0-beta-3-released
The OpenELEC team is proud to announce its 3rd Beta of OpenELEC 6.0. Internally this will be known by the less-catchy name OpenELEC 5.95.3.
The OpenELEC 5.95 release series are test releases (beta) for OpenELEC-6.0.
OpenELEC-6.0 will be the next stable release, which is a feature release and the successor of OpenELEC-5.0.
The most visible change is the update from Kodi-14.2 Helix to Kodi-15.0 Isengard (rc 2). Beginning with Kodi-15 most audio encoder, audio decoder, PVR and visualisation addons are no longer included in our base OS, but they are available via Kodi's addon manager and must be installed from there, if needed. Our own PVR backends such as VDR and TVHeadend will install needed dependencies automatically. Other than that, please refer to http://kodi.tv/kodi-15-0-isengard-rc-2/
to see all the changes in Kodi-15.