Technically it's not a street date break, most likely it's similar to the Ocarina of Time 3D and Super Mario 3D Land situation, but GAME has announced that if you have a pre-order for The Legend of Zelda: Skyward Sword, you are now free to come in and pick it up.
It's probably a result of grey imports being sold in other stores, but if you have a pre-order at GAME, you are now able to get a copy of Skyward Sword a day before its official release. We will update this story if any other retailers break.
UPDATE: Both JB Hifi and EB Games are sending texts to those who have placed pre-orders on SKyward Sword. You should be able to go and pick up your pre-orders now.