Here is what some one on the Steam forums has put -
Quote:
Short answer: timezones
It unlocks simultaneously for the "international" release region.
For me (Australia), it unlocks at ~5am on the 1st of April, at the same moment it unlocks for you.
It unlocks at midnight somewhere.
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That doesnt make sense really, release is the 31st which is 12:01amGMT, if its to coincide with a International release that would be GMT+18 hours.