5.0.14 is the version of the CodeWarrior build plugin, basically a DLL which integrates the compiler into the IDE. But it only contains the adaptation code for the ide, nothing to actually generate code.
The build plugin has its own release notes
Release_Notes\HC12\Notes_Build_Plugins.txt
but basically there has not much changed recently.
If bugs not mentioned as fixed are contained? Well possibly, I would say.
Daniel