The Experimental branch is always open — you can opt in at any time.
When a major update such as EA 1.2 is scheduled, the new content is deployed to the Experimental branch ahead of its release, so you can play it before it arrives on the default branch. Once that update goes live, both branches run the same content, and the Experimental branch stays on that version until the next major update is ready.
When will the Experimental branch become available?
Updated
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