From any version or from 7 pro ?
standalone or oem ?
You will be able to upgrade from any consumer edition of Windows 7 to Windows 8 Pro and bring everything along which includes your Windows settings, personal files, and apps. If you are upgrading from Windows Vista, you will be able to bring along your Windows settings and personal files, and if you are upgrading from Windows XP you will only be able to bring along your personal files.
Any consumer version of Windows 7 to Win 8 Pro, apparently. I wonder if the 'consumer edition' means, "Not OEM discs", or whether it means, "Not big business mass licenses". I'd guess the latter... I'm using a Win 7 upgrade which I upgraded from a Dell OEM Windows Vista disc. I assume the Win 8 upgrade would be the same.
It would kinda defeat the point of the whole "upgrade your OS" if it only works for the 0.001% of consumers who built their PCs from scratch, and excludes all the OEM installs... but I don't know for sure.
Another thing that needs clarification, is whether it's any consumer version of Windows XP or Windows Vista - he said Windows XP, Windows Vista, and Windows 7, but then specifically mentioned any version of Windows 7, and didn't say what version of XP or Vista is needed to upgrade to Win 8 Pro.