User blog comment:HaLo2FrEeEk/Full Dawnguard playthrough coming Tuesday!/@comment-58.107.87.185-20120626021503/@comment-4706462-20120626034614

Xbox Live is updated with new content between 3 and 8 am Eastern Standard. The absolute earliest it could be released is three hours and fiften minutes from now, but I think it will be closer to 5 am.