The Blender Foundation has released the first release candidate of Blender 2.63 with the new BMesh feature and improvements on Cycles and the Motion Tracker.
Blender 2.63 RC1 new features include:
BMesh is the new Blender mesh system with full support for N-sided polygons instead of only triangles and quads.
Among the features added in this release are support for rendering environment maps, render layer mask layers, a shadow render pass, ambient occlusion and float precision textures.
- Motion Tracker:
Motion tracking got some improvements which are mostly relates on 2D stabilization and few smaller tools.
Blender 2.63 RC1: Download | Release Notes