MythTV 0.24.2 is just a minor update to this open-source DVR program, but it's the first update at all since last May. As such, there's a lot of fixes that have been incorporated into the release.
Those wanting to find out what's new in MythTV 0.24.2, see the release notes. There's a variety of fixes throughout the stack.
Meanwhile, still under development is MythTV 0.25 with its many changes.