Earlier quoted context omitted.
The combo of thinner/lighter/no fan is pretty awesome in my opinion. These aren't for peopled doing hardcore computing, they're for people doing hardcore commuting really.
Do you have a source for the "no fan" bit? If the Core M processor can deliver the same performance as a Haswell ultrabook processor (i.e. the previous Air) without requiring a fan or getting unreasonably hot, I think that's a pretty nice feature.
"What's on the inside is just as innovative as the outside. Latest unibody architecture. New MacBook has no fan at all."