Quantum Break Discussion
Trainer Tools and Resources
"You may pre-download this game, but it will not be playable until 12:01 AM EST on the release date."
Though, that's only the Xbox One version. It also says the following regarding the Windows version:
"Free Quantum Break Windows 10 game offer valid with pre-order of digital copy of Quantum Break for Xbox One, by April 4, 2016. Windows 10 game code will be sent via Xbox system message around the week of April 5, 2016."
So it should be playable on Xbox One at midnight, but you'll have to wait for your code to download it on your PC if you ordered it like I did. Not too sure about playability if you only ordered it for PC.
Looks like I won't be playing this game for a while.
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