"The first change it jumps into the eye is the new Plasma appearance, called Air now. It is brighter than the old one, but I found it looking not so appealing, at least not for the desktop widgets. Here's how the desktop looks in Kubuntu Jaunty, with several widgets running on the desktop:
"KRunner received several great improvements: it now displays the applications to be run as a list (see screenshot) and this list can be customised too. See below:"