This is purely a bugfix/maintenance release. If you are using a very recent version of FFmpeg or libav that has switched to using planar audio in its API you will need this.
If you are using MLT with the DVEO (formerly Linsys) SDI or ASI cards on Linux, you should know that the drivers stopped building somewhere between kernel 3.0 and 3.2. The Open Broadcast Encoder project made some simple fixes available on their github repo.