Key improvements of the GRASS 6.4.2 release include enhanced
portability for MS-Windows (native support), major fixes for the new
wxPython based portable graphical interface, and new functionality
(new network tools, zonal support for univariate statistics, image
processing improvements, GRASS Python Library extensions,
an embedded interactive Python Shell, an experimental Graphical
Modeler, and new Cartographic Composer front-end to ps.map).
Overview of changes
Since the 6.4.0 release in September 2010 more than 1230 source code
modifications have been made to the 6.4.x release branch.
Between 6.4.2RC2 in Nov 2011 and the current 6.4.2RC3 more than
80 updates have been applied.