In fact, overall, all of the Plasma animations and interactions look and feel better. The desktop feels a lot more responsive and first class. I’d say that if 4.7 also maintains this level of polish while adding on some features, KDE 4.x will be perfect. The only danger there is developers becoming bored and adding all kinds of ridiculous glitz once everything works perfectly. I know that, generally, different developers work on different projects, but now that the desktop is working great, I’d like to see some more work on getting Nepomuk, Akonadi, Kontact and other auxiliary programs up to the same level of quality. More likely, I’d like to see them continue to refine Activities and make them more powerful.
When I first upgraded, the Plasma desktop was a lot crashier. Since then there’s been a Fedora patch that may have fixed it. I’ve also been spending a lot less time in front of the computer in the past week, so maybe it’s still there. At any rate, KDE 4.6.2 is already out and will hopefully land in Fedora soon and fix additional bugs.