A major chunk of the features once available only to "pros" and available only in "pro" applications, are now mostly accessible to the average consumer in outrageously easy and user-friendly implementations.It's all about the rise of the Prosumer.
It's an iPad with a keyboard attachment that runs OS X.
So it's a laptop.
But *much* more Air than even the Air.
For a more casual user who wants to stay connected on the go, and for whom an iPad just doesn't offer enough functionality, the MacBook is a great choice.
It makes perfect sense as an addition to the lineup.