The plugin has been rewritten from the ground up. Highlights include: support for Max 2008/9/10 (and when available, 2011), 32-bit and 64-bit flavors, toolbar and menu for creating and controlling the simulation, modifier-based approach to match workflow in Max, improved artist interface, physical material system for using and adjusting physics properties on many objects at once, constraint presets for common workflows, improved constraint visualization and performance, ability to bake simulation results to keyframes for offline rendering, new documentation rewritten from scratch, etc. More at NVidia forums.
Good news, so a new RayFireTool version is hopefully available soon!