KDevelop 4 is now available in lucid-backports for users of the newly released 10.04 LTS.
Enable "Unsupported Updates" in your software repositories and install "kdevelop".
Packages for the release of the KDE Software Compilation 4.4.3 are available.
Users of 10.04 LTS can install it from the Kubuntu Updates PPA.
To update, use the Software Repository Guide to add the following repository to your software sources list:
ppa:kubuntu-ppa/ppa
If you want to try out Qt 4.7 and the interesting new world of Qt Quick ("from now on the way to make GUIs"), Kubuntu 10.04 users can try it from the experimental PPA. The Qt Creator packages there have Qt Quick designer integration.
KOffice 2.2 is out. Users of Kubuntu 10.04 can install it from lucid-backport, just enable "Unsupported Updates" in your software source settings and install "koffice".