It’s a classic word processing feature that we all know of: pagination. That is to show what seems to be a visual representation of an actual page, therefore keeping your work more orderly. Second is native printing, which is exclusive to Google Chrome users (only for now, says Luiz Pereira, Software Engineer at Google) and allows the user to print what exactly appears on the screen and web browser, without exporting and converting to a PDF, then printing later on. More great improvements = a smarter web app.
Via: Google Docs Blog