Preview at WWDC likely in June, followed by September launch.
Apple's January Event to Focus on Publishing and eBooks
According to the source the event will not involve any hardware at and instead will focus on publishing and eBooks (sold through Apple’s iBooks platform) rather than iAds. Attendance also be more publishing industry-oriented than consumer.One possible topic of the event is an expansion of the iBookstore to sell textbooks. In his biography of Steve Jobs, Walter Isaacson said the textbook industry was one Jobs looking to revolutionize with the iPad.