If the same holds true with how they did Windows 7 >> Windows 8 upgrade, it will download to a folder and you could save the folder out and use it to install Windows 10. I am sure 7 days after the initial release there will be blogs explaining how to do it.
I just read if you have Windows 8.1 standard it will get a Windows 10 Home upgrade.
I still have a Windows 7 Pro license I never used. Windows 7 Pro gets an upgrade to Windows 10 Pro. I might just have to downgrade my tablet to Windows 7 Pro just so I can get Windows 10 Pro. Hmmmm...
The only thing I know for now is that Windows 10 will be provided as an optional Windows update through the application of the same name for Windows 7/8.1 users. I don't know if it will be provided through ISO, but maybe the recovery DVD will, just like Windows 7.
The problem for me is that anyone that has upgraded Windows in the past should know that you have a 50/50 chance of hosing up drivers or having other issues after the "upgrade". Typically these cannot be fixed easily if at all.
I even had a Windows 8 tablet (that was shipped with Windows 8) and after the "upgrade" to Windows 8.1 it had a lot of issues. The fix was to save everything and tell Windows 8.1 to completely re-install itself like a clean install. It did fix a lot of problems
It is ALWAYS best and recommended to do a CLEAN install when going from one version of Windows to a newer version of Windows.
You are welcome.Thanks, that is most helpful.