Add the Neon5 repository:
sudo apt-add-repository ppa:neon/kf5-snapshot-weekly sudo apt-get update
(If you would like more frequent updates, (which also bear the risk of breaking more often!), use "ppa:neon/kf5-snapshot-daily" or "ppa:neon/kf5" for the most frequent updates. To install Project Neon 5, issue the command
sudo apt-get install project-neon5-session project-neon5-utils \ project-neon5-konsole
The LightDM login screen will now offer a Project Neon 5 session. You can also run neon5-env, and start plasma-shell from there. By default, we start an xterm with the environment set up. In order to start plasma, run "plasma-shell", for Konsole, start "konsole". If you want to keep your current session running (which is probably most convenient), you can run
neon5-env plasma-shell --windowed
to start Plasma in a window (not as desktop or root window).
openSUSE offers snapshots from git master updated frequently as well. Add the KDE:Unstable:Frameworks repository (http://en.opensuse.org/SDB:KDE_repositories#Plasma_Next) and the Qt53 repository (available at the same link) and install the plasma-next-session package to have a session available at the next login.
Gentoo provides beta as well as live ebuilds inside kde overlay, with dependencies in qt overlay. The following assumes you have a basic understanding of Gentoo Portage and already set up layman initially:
layman -a kde && layman -a qt emerge @kde-next-live --autounmask-write=y
To make the most of it, run
layman -S && smart-live-rebuild
to get the latest packaging changes for qt and kde and update any live packages that got new commits since last time.
See also: Gentoo KDE/Frameworks Packaging Status
Following the instructions here it will automatically build all KDE software that has a KF5 port, most notably the Plasma workspaces, but also development previews of Kate, Konsole and Dolphin.
Afterwards follow the guides for "Runtime setup" and then run "kwin --replace" and "plasmashell".
More information at http://kshadeslayer.wordpress.com/2013/12/03/introducing-project-neon-5-isos/