After looking at different 3D packages here's my wish list.

• Hair
• Cloth
• Better control with physics
• More control for wind (draw wind paths)
• Liquid dynamics
• True Volume materials (Like Hypervoxels(Lightwave) or Smells Like Almonds(Cinema4D))
• Character Animation Tools (Muscle, skin deformation, lip sync, tendons and pose adjustment tools)
• Better FBX support
• More control over instancing
• Other types of plants that you can deform with the wind modifier (Grass, flowers etc)
• Better skies
• More control of the particle system
• Soft body dynamics
• Geometry paint
• Direct X export (Full export geometry, textures and animations)
• Scripting

I think this would really make Carrara a contender with the big 3.