Unity and Compiz Changes is Ubuntu 15.04
Unity has had many bugs fixed and new features added. Locally integrated menus are now available for unfocussed windows. There have been a number of usability improvements to the dash.
A configuration option to have menus displayed at all times instead of only on mouseover.
Enable the Dash, HUD, or logout dialogs over fullscreen windows.
Tweaks to animations for faster startup and shutdown experiences.
Fixes for various problems that occur only with the nVidia proprietary driver (mostly blank or black windows) (thanks nVidia).
Full integrated support for the MATE desktop on a par with Gnome2 and Unity
Refresh of the gtk-window-decorator for Gnome2 support