Bloomberg and the Wall Street Journal seemed pretty sure that an iPhone nano was inbound, but the New York Times' anonymous sources dispute that tale -- the paper writes that "Apple is not currently developing a smaller iPhone," and that the company is "not planning to introduce a smaller iPhone anytime soon." While the publication doesn't outright deny the existence of such a device at any point in the story, it does quote an anonymous Apple executive as saying that it doesn't make sense for the company to create multiple iPhone form factors at any given time, and an anonymous Apple engineer as saying that cheaper components, not a smaller size, would make for a cheaper overall price.
engadget.com
