of course - there is the chance that Apple will challenge the "$300 textbook" market with it's unreleased 'tools'. Let's wait and see, eh?
Yes—because the first thing they did with iBooks was lower the average price for ebooks. (Oh, wait.) iBooks is built entirely around allowing the publisher to set whatever price they want, and then Apple takes their cut from that. Apple gets to profit more from publisher greed. Apple has no incentive to lower textbook pricing for the student/consumer. They have no history of trying to do so thus far.