The next wave of that impact won't come from iBooks 3 or the new version of iBooks Author, which are both nice, but relatively minor updates. If anything from Tuesday's event will help push digital textbook adoption forward, it's the hardware. Specifically, the iPad Mini. By offering a $329 tablet, Apple suddenly made iPad adoption notably more affordable for cash-strapped school districts. Apple also released the fourth generation 10-inch iPad, which should help drive down the price of the company's older devices as well.