from a forum post i read earlier it's not until 1am EST and launching in all of US at same time. so that would be 12am CST. 11pm MST, 10pm PST i believe.
This is different than what I saw Yesterday but appearntly it's 1am New York time which is still 45 minutes for me. Hope the Devs didnt screw up central time cuz the map shows 1am for new york eastern time and 1 hour away is me central time and thats 11pm LOLz