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They may want to let updates go out slowly at first to mitigate risk of regression, and only push it more broadly once they have some of us try it out. If there are some issues that crop up they can stop pushing the update until they have a solution and have limited the 'damage' so to speak. That's probably why it is not yet available for download - they are just trying to make sure.
As to how they determine which devices to push it to of those which are available, who knows? But probably they are looking for a representative sample of the installed base.
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