Apple just updated their End User License Agreement for iBooks. Apple clarified that they're not claiming sole distribution rights for content formatted with their software, just content that goes out in the iBooks format.
Some observations:
Apple's already working with the major K-12 textbook publishers. Putting together a textbook and getting it past the bozos that run some of the state school boards is a byzantine process rife with politics. That's the major barrier-to-entry for the K-12 market.
Second, Android lovers are free to write a conversion tool to port iBooks files to Rancid Cookie Dough, or Stung by Cheap Tech, or whatever they're calling their OS now. Apple's made it clear they're not claiming the content, just the content that's being put out into the world in its proprietary format.
Third, the 30% Apple takes from sales is not just for the use of the software, but Apple's distribution ecosystem. They've built and refined iTunes for years now. They're offering not just a way for users to pay for content, but for them to find the content in a fairly well-organized system. The user interface matters.
Fourth, under the new EULA, nobody's stopping anyone from formatting their content with iBooks, posting it free on their website and adding a donate button. Which is just how some college profs may post supplemental materials for their courses. Also don't be surprised to see profs and others use this avenue to, essentially, crowd-source their editing process. It's cheaper than hiring an assistant, and it's a lot more eyeballs involved in the editing process than a couple of interns.
Fifth, speaking of crowdsourcing, also expect innovative early-adopters in the education field to put their classes to work, essentially writing their own textbooks. The magic word here for teachers who have a mind to so guid their students is FREE. There are, thankfully, some teachers who like to guide their students to get really hands-on with their learning, and iBooks looks to be a fantastic tool for them. It clearly leaves PowerPoint in the dust. This may be where some of the most interesting content gets generated/aggregated.
Sixth, I buried the lead.