The 1.3 Version are always Alpha / Developer Verions - the next stable Version will be 1.4.0 .
The System is in heavy reconstruct (from article to shop) also the i18n (english admin interface) support - which will be ready for the 2.0 Version - is nearly ready for using
1.0 Final is Out. Most features are stable now. Next Versions will come with more flexibility in the code ( better OO - classes & functions) and less overhead - and hopefully better code..
Some things related to the rc6:
most errors from RC 5 are fixed
some known issues are in this relaese but function is nearly stable
missing functions are in the filemanager, rightsmanagement and small things in other areas ...
language files are not uptodate, only german is complete)
The Project is just registered at sf.net.
Next to come is the CVS and the old SAS zip Files.