Project Neon, the daily builds of KDE Frameworks 5 and KDE Plasma 2 for Kubuntu, has started releasing ISO images for testing. These are very early previews of the next generation of KDE Software. It is strongly recommended not be installed on a production machine but can be tested as live images or installed into a VirtualBox or other VM. Crashes and bugs are virtually guaranteed. The only supported upgrade path is to install a later ISO image. More information on Rohan's blog. Project Neon introduction on the Dot.
Experimental. Not for use in production environments.