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http://us.battle.net/d3/en/blog/5338015/Launch_Day_Preparation_Guide-5_7_2012#blog
Blizzard made a launch day preperation guide to make sure you're ready to go.
Most of this stuff is pretty basic, but it does contain dates and times of several things. One of which is that they will allow you to install the game on monday morning and update to the newest patch.
And don't forget to make your battletag!
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