3.0.1 was just a big fix version.
3.0.3, 3.0.2 and 3.0.1 are fix version based on the 3.0 major release.
The latter replaces the previous 2.5.1 version which will not be supported anymore before the end of January.
This 3.0 new version is a major new release as it contains the shell login scripts and the new X11 login scripts. A full reorganisation had been undertaken on the architectural point of view. The shell part of the package consists only in bug fixes, improvements of some features and optimisation. The X11 part is new and provides the first implementation of an HEP X11 environment.
This new version is already deployed now on various services at CERN and at INFN Pisa.
The documentation consists now on several documents. Some are not yet available but the most important ones are now in an acceptable state for release.
As it is difficult for the author(s) to understand what you don't understand, any remark on the documentation is welcome and we hope to improve it and add your contributions.
A paper had been presented in september 1995 CHEP'95 at Rio. And there are even more slides in preparation for future presentations.
A lot of people are contributing to the HEPiX login scripts project. There are 2 working groups which have regular meetings and work as well with electronic mailing lists:
You can find information, studies, reports, minutes, specifications and materials on their respective welcome pages.