Much awaited new features for Cycles renderer include deformation motion blur, fire/smoke and volume rendering and a baking API.
User interface now allows for draggable popups and resizable preview widgets. Animation has new interpolation types with “easing equations” presets.
Modeling now allows to “split normals” and Sculpting/Painting has new HSL color wheel and constant detail in dyntopo.
Game development now allows deactivating logic bricks, multi-threaded animations, cast only materials and “unlimited” action layers. Freestyle NPR rendering has a new textured strokes feature, along with line sorting options.
For more info, please you see: http://www.blender.org/features/2-71/
For download: http://www.blender.org/download/