Kdevelop 4 and kdevplatform beta9 .deb packages for Kubuntu Karmic 9.10 (with kde 4.4.1 from ppa:kubuntu-ppa/backports) are available on my kdevelop PPA.

Kdevelop beta9 about dialog

You can add my kdevelop PPA running:

sudo add-apt-repository ppa:daniele.domenichelli/kdevelop
sudo apt-get update

Then to install kdevelop, just run

sudo apt-get install kdevelop

or if you installed beta8 packages from my PPA, just run

sudo apt-get update
sudo apt-get upgrade

On the same ppa you’ll find some kdevelop plugins:

Official betas:

kdevelop-plugin-php (beta3)
kdevelop-plugin-php-docs (beta3)

Official betas + patches from svn:

kdevelop-plugin-executebrowser (beta1+svn)
kdevelop-plugin-executescript (beta1+svn)
kdevelop-plugin-xdebug (beta1+svn)

From KDE Playgroud (warning: Source is taken from svn and it’s not supposed to be released yet, so it might not work or might break kdevelop install, so use them only if you know what you are doing…)

kdevelop-plugin-playground-bazaar
kdevelop-plugin-playground-controlflowgraph
kdevelop-plugin-playground-coverage
kdevelop-plugin-playground-css
kdevelop-plugin-playground-gettersetter
kdevelop-plugin-playground-git
kdevelop-plugin-playground-mercurial
kdevelop-plugin-playground-valgrind
kdevplatformveritas
--- Edit: added right now
kdevelop-plugin-playground-qtdesigner
kdevelop-plugin-extragear-upload

Please report me any bug in plugin packaging (missing dependencies, etc.) but report to the kdevelop developers bugs related to the plugin itself.