Some new things are introduced, here is an overview. I do not like Unity so far, takes some getting used to not having the top panel and the menu not work the same as it used to. The Ubuntu menu now pulls up an app search instead of software categories. There os no more panel on the bottom, instead its on the left and has active apps as weel as bookmarked ones. I was hoping this upgrade would not break my php5.2 install from karmic repos and it did not. yeey!