From the beginning, Spellman made it very clear to teachers that the iPads would not be destroying their oh-so-diligently prepared curriculum maps--the iPads would serve the curriculum and not the other way around.
They created this website to monitor progress in their initiative (it contains both a "hard copy" book list and an iBook/ePub/App list which was given to students over the summer--this gives you an idea of how many "old fashioned" textbooks they are using compared to books on iPad):
http://www.spellman.com/s/190/index.aspx?sid=190&gid=1&pgid=1516