Subversion, as many of you already may know, is a really cool version control system.
It's full of features and i think it will supersede the good old CVS, look at http://subversion.tigris.org for more informations about this great app.
CodeWarrior, at this time, is supporting CVS via the mwCVS plugin and i think a "mwSVN" plugin should be very handy and a powerfull tool, without to mention great advantages for CodeWarrior offering support for SVN too.
Currently we don't have plans to add in support for this. However I will add this to our feature requests so that this can be considered for addition in future releases.