"With Blender 2.5, the user-interface is being redesigned and bringing rewritten components like a new file browser, customizable tool shelf, support for multiple windows, and customizable keyboard shortcuts.
"Beyond a new look for Blender 2.5, the rendering code in this new alpha release has much faster ray-tracing, support for volumetric rendering, and a new interface is being worked on to begin supporting renderers external to Blender. Furthermore, there is a new Operator tool system, data access for .blend files have been changed, and with the animation system now everything (as in every single object) can be animated."
