We only got access because the matchmaking had some serious issues at the moment. The towers were empty and no one could find a match in the Crucible. So while Bungie was fixing that issue, they opened the Moon up just so people have something else to do. That is why the Moon was open for such a short time. After they fixed the issues, they locked the Moon again since the matchmaking was back to normal.
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Actually no..if you read deej's weekly update post from Friday they said they were going to open up a new area for two hours and then had a picture of the moon. Didn't take much to connect the dots from there.