it seems win 10 will have a default product key
u must fully compute the upgrade first then it sends MS information.
just reserving the upgrade doesn't send anything information to MS like keys/hardware ID
That confirms that you won't simply be able to install 10 clean from an ISO using a 7 key. You will need to go through the upgrade process once its released to get a license. Then you can reinstall after.
Some other things confirmed on that page are that Retail will remain Retail, and that you can't downgrade back once you take 10.
If I install the preview, can I upgrade it to the final once it releases?
If you install the preview over a 7 or 8 install using the Windows Update method, yes.
If you clean install the Preview from an ISO, no.
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