Authors can also publish updates to their ebooks through iBooks Author. Users will be notified of available book updates through the iBooks iOS app.
iBooks Author was first released in the Mac App Store in January and allows users to create electronic textbooks or books of any other kind for publishing in Apple's iBookstore. The app is free and requires a Mac running OS X 10.7.2 or later.
The updated iBooks Author will be available for download starting today through the Mac App Store [App Store].