I'm still curious how the upgrade process will work in the end.... for example, is it possible to do a clean install or do you have to upgrade an existing Windows installation? How is a "qualified device" detected, especially if clean installs are possible? Will you still get a product key (I'd guess no because you could reuse it for another machine, that is, unless activation is permitted only for one machine and cannot be changed)...
Should be no prob at official ISOs. Besides of that things have settled, our measures took effect. Anyway reading both sources closely there is no word saying the upgrade via WU will come as ISO...
I didn't dig into the matter with upgrade stuff but one is for sure that enterprise and VL versions will be available as isos only ... afaik
Grabbing an iso from Windows Update, is a fairly simple operation, providing you are savvy enough to do it.