Packages for the release of the KDE Platform, Workspaces and Applications 4.7.2 are available for Kubuntu oneiric. You can get it from the Kubuntu Updates PPA until the packages are available in the official repositories. Packages for 11.04 will follow soon.
To update, use the Software Repository Guide to add the following repository to your software sources list:
Many thanks go to Philip, Rohan, Scott and Jonathan for working on the packages!