1) The default music player is Rhythmbox from Banshee media player.
2) The original browser is still there Firefox however in 12.04 its been upgraded to 11.0(beta version). The full version will be ready when Ubuntu 12.04 will be released.
3) Libre office has been updated to version 3.5
4) Ubuntu Software Center has a better appearance. A ‘Recommendation’is now available on it.
5) It comes with a new feature which allows you to Sync folder within the application
6) New features available in System settings.
7) HUD (Heads Up Display) – This feature allows you to items in the menu bar. It has really been improved in 12.04. However this application does not work with all the applications. For instance Libre office has no global menu in 12.04 which implies this feature cannot be used on Libre office.
There have been no other major changes. Though the boot up screen has a slight change because the User Interface on it has been changed from 3D to 2D for computer which cannot support 3D.