I've released mkvtoolnix v7.4.0. It's mostly a bug-fix release, though kind of important if you mux HEVC or teletext subtitles.
Starting with this release I'm also providing 32bit and 64bit binaries for Debian 8 »jessie« and Fedora Core 21. On the other hand no more binaries will be provided for openSUSE 12.3 and Fedora Core 18 and 19.