timppu: So how about if I need to reinstall it after the year, or decide to go back to Windows 7 for now, and then three years later want to upgrade back to it?
If it means I have to install it within a year (and no re-installation from the scratch can be performed after that), I think I'll leave it. It will come preloaded on some future PC I buy at some point anyway, I'll use it then.
I have the same question and didn't manage to find an answer yet. It seems no-one knows but MS themselves. What I'd like to get on 29 july is an .iso that I can downloaded and use for a clean install at a time I choose, now, more than a year from now or years from now if I already got Windows 10 but just want to re-install to start over with a fresh system.
And I like my Windows 7 retail copy to stay valid as well and have the option to switch back to Windows 7 or create a dual-boot if Windows 10 turns out to be too unstable or incompatible with my current hard- or software or games.
My worst nightmare is if Windows 10 is just some very large Windows-update file without the option for clean install and at the same time making Windows 7 invalid. That, or they make it such that if over a year from now your system crashes and you need to re-install, you suddenly need to pay for that re-install, making a crash an unexpected expensive thing.