I haven't done too much research yet on Win10 as I was waiting for it to release and have some time to flesh out some of the more vague parts - primarily how upgrades work, if they are tied to motherboards, can you do a clean install, and what type of information is gathered on the OS.
It looks like you can download the install media rather than going through Windows Update, even if you are doing an update, through here: https://www.microsoft.com/en-us/software-download/windows10
With respect to information gathering, other than all the options the OS provides for turning things off, I believe one of the most important things to do is to remain logged into a local account, much like Win 8.1, as this is indeed possible. This will of course prevent use of the MS Store and many apps, but you will not be permanently logged into cloud based services, which may have different TOS than the OS itself and could be gathering information on you.
Is anyone able to clarify if a fully clean install is possible without first upgrading, once you have upgraded at least once? Also, has anyone determined with certainty if you change your hardware ID (motherboard swap) if you can reinstall or if you are then forced to purchase a copy of Win10?
It looks like you can download the install media rather than going through Windows Update, even if you are doing an update, through here: https://www.microsoft.com/en-us/software-download/windows10
With respect to information gathering, other than all the options the OS provides for turning things off, I believe one of the most important things to do is to remain logged into a local account, much like Win 8.1, as this is indeed possible. This will of course prevent use of the MS Store and many apps, but you will not be permanently logged into cloud based services, which may have different TOS than the OS itself and could be gathering information on you.
Is anyone able to clarify if a fully clean install is possible without first upgrading, once you have upgraded at least once? Also, has anyone determined with certainty if you change your hardware ID (motherboard swap) if you can reinstall or if you are then forced to purchase a copy of Win10?