Doc for Vaadin 14.1.0 alphas?

I see on the JavaDoc page:
…that alpha pre-release versions are available for Vaadin 14.1.

➥ Can someone point me to documentation for what is new or different?

➥ Is there any list of what items to focus on for testing?

I just found The Vaadin Roadmap:

Any other sources of information about the prereleases?

Hi Basil. We will do more official announcements once we have locked things for the Vaadin beta release.
We are still finalizing the things, so in one to two weeks all the included should be available and ready for feedback.
For further information, the releases page in has some additional details about what is included in which release and (eventually) how to take those into use.