Windows 8 is designed for a touchscreen.
This seems to be the TL;DR of many reviews. If this becomes 'common wisdom', which looks likely, then I think MS are going to lose a lot of people on the upgrade train as this guy suggests.
And this is the key to Microsoft's strategy with Windows 8. Roll out their next generation paradigm while piggy-backing on the momentum of their current generation software and infrastructure. If they had waited too long to transition, it would have been a situation of "well if I have to relearn everything anyways...". Forcing this paradigm on their desktop and server customers now was key to keeping the majority of their userbase in the transition.
Bet he was thinking about Windows 7, Vista and XP
Themselves. On the desktop, there may not be a compelling reason to upgrade to Windows 8...with the exception of IE10. As a former enterprise IT manager, I would seriously consider staying with Windows 7 and switching my users wholesale to Chrome or Firefox...despite the lack of GPO options with either of those.