The first beta of the Bionic Beaver (to become 18.04) has now been released, and is available for download!
This milestone features images for Kubuntu, Ubuntu Budgie, Ubuntu Kylin, Ubuntu MATE, and Xubuntu.
Pre-releases of the Bionic Beaver are not encouraged for:
* anyone needing a stable system
* anyone who is not comfortable running into occasional,
even frequent breakage.
They are, however, recommended for:
* Ubuntu flavour developers
* those who want to help in testing, reporting, and fixing
bugs
as we work towards getting this release ready.
Beta 1 includes some software updates that are ready for broader testing. However, it is quite an early set of images, so you should expect some bugs.
The full text of the announcement: https://lists.ubuntu.com/archives/ubuntu-release/2018-March/004321.html
The Kubuntu 18.04 Beta 1 images can be downloaded from:
http://cdimage.ubuntu.com/kubuntu/releases/18.04/beta-1/
More information about Kubuntu 18.04 Beta 1 can be found here:
https://wiki.ubuntu.com/BionicBeaver/Beta1/Kubuntu