Less than a month after releasing later version of Luxrender, is new update released. According to Luxrender forum what really motivated this new release is the Blender 2.64 release which was incompatible with the LuxRender v1.0 exporter. New version brings a speed improvement ranging from 10 to 40%, a brand new, more realistic sky model and various improvements. This version should be also best to answer your questions in the forums or in the bug tracker.