Mumble 1.2.5, the successor of 1.2.4 is currently in development.
Feedback encouraged! - We rely on your testing and feedback to improve Mumble, if you find any bugs in the current stable or in a recent snapshot please report them using our bugtracker. If you think we lack an important feature take a look at the corresponding feature tracker.
Development is in very early stages and we have not yet added any new features.