A final 12.0 version is planned for end of 2013.
@mariocesar: We have a new team of mantainers for sorl-thumbnail. I wan’t to encourage all developers that have fixes, forks and new features to talk in the irc channel of the project. irc://freenode.net/#sorl-thumbnail
@nikko: Unfortunately I no longer work with Django so my motivation to keep developing for sorl-thumbnail is very low. If you are interested in taking over this project please send an email to mikko@aino.se explaing why you are the perfect fit for owning this project.