KDE 4.0.3 has just been released. Here are the change logs. Updating on gutsy is as easy as ever. Fire your synaptics or your update notifications ( the orangish star in your taskbar).
Though now I am pretty much settled in with 4.0.1, I hope this upgrade solves some of my common problems. Currently updating 4.0.1 to 4.0.3 after a failed attempt in updating to KDE 4.0.2.
KDE 4.0.3 works beautifully. Feels more stable and fixes a lot of bugs.If you missed out the 4.0.2 upgrade, this is highly recommended ;). Enjoy the KDE4 experience