Red, pink and blue; bright colours for the Touch Covers that snap onto Surface and turn it into a notebook you can balance on your lap.
Dotted outline: the keyboard cover is optional and removable. But it's in every image, because it's going to be a huge part of the product story and you're going to want it.
16:9: when we picked up our badges for the Surface event, even before we saw PRs from the Windows team, we could tell it was going to be a tablet - because what else has the 16:9 ratio? And the dotted lines from the keyboard were used on things like the card with our demo slot on and the card with the Wi-Fi password on.
Even on the chalked keyboards you can see details like the two buttons for the touch pad or the markings for the home keys...