You can find all details about it in the link. It’s a polished and beautiful version of the game that’s been in Beta.
The Beta is presently available. This post gives you an outline of what to download to play. To stress, this Beta is significantly behind where we are now, but will give you a taste of some of the ideas.
There is a Discord for discussion of the Beta here. It also includes some extra player generated resources and lovely chatty folks.