A update has been pushed to the official updates-testing.
You should probably use that one and uninstall mine beforehand.
Test it and leave karma.
Old Post Follows:
Mumble 1.2.5 came out a few weeks ago but the version in Fedora is still stuck on 1.2.4. Since I don't know what the protocol is for prodding package maintainers to push updates and I recently stumbled across COPR I decided to try making an update myself.
What's COPR? Read yourself. https://fedorahosted.org/copr/wiki/UserDocs#FAQ
Short version is someone loads some source code into it and it compiles, packages and hosts a repository to install it from.
Here's my attempt.
The existing RPM SPEC file from 1.2.4 worked with only trivial changes for 1.2.5. Some day I should try packaging my own code and writing a SPEC from scratch.