Yesterday, AllThingsD reported that Apple is planning a late January media event in New York City that appeared to have something to do with Apple's publishing or advertising efforts rather than any hardware announcements. TechCrunch weighed in a few hours later with word that the event is indeed focused on publishing and the iBookstore. At the time of our report on that information, we suggested that digital textbooks could be a possibility for the event given that Steve Jobs' biographer Walter Isaacson has indicated several times that one of Jobs' last goals had been to revolutionize textbooks.