Cross posting from the Ubuntu 25.04 FAQ we now have a first plucky concept ISO published at https://people.canonical.com/~platform/images/ubuntu-concept/plucky-desktop-arm64+x1e.iso
This includes all the Ubuntu Concept fixes that did not make it into the proper 25.04 release (should work on 64 GB machines out of the box) and defaults to the -qcom-x1e PPA kernel.
At this point it should be almost identical to an 24.10 concept ISO installation upgraded to 25.04 but we will continue our more bleeding-edge development there and keep the plucky ISO up-to-date.