Some bugfixes to load/save game and support for modding how likely a culture template is to be generated for a specific terraintype. This is the first step of race/culture modding, which will eventually allow adding new races and cultures.
Documentation for the new modfile: http://wizardsandwarlords.net/forums/viewtopic.php?pid=15#p15
Download link: http://wizardsandwarlords.net/files/WizardsAndWarlords002b.zip
.NET 4.0: http://www.microsoft.com/en-us/download/details.aspx?id=17851