The previously announced KDE Platform, Workspaces and Applications 4.7.3 updates have completed QA testing and have been released to all users in the oneiric-updates repository.
Packages for the release of the KDE Platform, Workspaces and Applications 4.7.4 are available for Kubuntu 11.10. Users of 11.10 can get it from the Kubuntu Updates PPA until the packages are available in the official repositories.