Unity 4.6

https://unity3d.com/unity/whats-new/unity-4.6

• Features
• Improvements
  • Core Improvements
  • Editor Improvements
  • Mecanim Improvements
  • 2D Improvements
  • Android Improvements
• Changes
  • Editor Changes
  • Graphics Changes
  • 2D Changes
• Fixes
  • Editor Fixes
  • Graphics Fixes
  • Animation Fixes
  • 2D Fixes
  • Mobile Fixes

Unity 4.5.5

https://unity3d.com/unity/whats-new/unity-4.5.5

• Improvements
• Fixes

Unity 4.5.4

https://unity3d.com/unity/whats-new/unity-4.5.4

• Features
• Improvements
• Fixes

Unity 4.5.3

https://unity3d.com/unity/whats-new/unity-4.5.3

• Features
• Fixes

Unity 4.5.2

https://unity3d.com/unity/whats-new/unity-4.5.2

• Fixes
• Known Issues

Unity 4.5.1

https://unity3d.com/unity/whats-new/unity-4.5.1

• Improvements
• Fixes
• Known Issues

Unity 4.5

https://unity3d.com/unity/whats-new/unity-4.5

• Features
  • Graphics features:
  • Module Manager:
  • Editor features:
  • 2D Physics features:
  • Unity Remote upgrade:
  • Mecanim features:
  • Windows Store apps features:
  • Other features:
• Improvements
• Changes
• Fixes
  • 2D Fixes
  • Android Fixes:
  • Editor Fixes:
  • Graphics Fixes:
  • iOS Fixes:
  • Mecanim Fixes:
  • Physics Fixes:
  • Windows Phone / Windows Store Apps Fixes:
  • Other Fixes:
• Upgrade guide
• Known issues

Unity 4.3.4

https://unity3d.com/unity/whats-new/unity-4.3.4

• Improvement
• Fixes

Unity 4.3.3

https://unity3d.com/unity/whats-new/unity-4.3.3

• Feature
• Change
• Improvement
• Fixes
• Known issues

Unity 4.3.2

https://unity3d.com/unity/whats-new/unity-4.3.2

• Fixes