(For new readers: It's over now)
Stef, the developer of Dominion Online has posted the following roughly an hour ago. For those reading later, the end time will be around Sunday, 19:00 UTC.
(Disclaimer: I'm doing moderating work for the game).
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This weekend (starting right now, lasting 48 hours) I've opened up one of the development machines. The next release will have a lot of changes, and this is a way to show and test them, and possibly get feedback.
If you're interested, you're welcome to go to https://alternative.dominion.games/ It's connected to a completely clean database so you'll have to sign up again. On this version you also can