I see this laptop as a "more productive iPad". I have a main MacBook Pro 15" that is permanently attached to two monitors, and a bunch of other devices. Having a secondary laptop that I can use on the go or in bed, without detaching the existing one, would be nice. So far I've been using my iPad for that purpose, but the 12" MacBook would provide me with a significantly nicer experience. At least for any task that isn't content consumption. For my use case, the single USB port is not an issue (as much as I otherwise dislike laptops with only a couple of USB ports).
I stopped using my iPad completely when I got the new Macbook. it's just as light, the screen is better, it's more comfortable to hold, and the keyboard is fantastic.
