Interesting... The other thing I wonder about is from a Blog post by the IOS Software Chief Architect at Kobo. His blog is at http://quatermain.tumblr.com/
but read back to http://quatermain.tumblr.com/day/2011/07/11
where he mentions moving to work for Apple. I wonder if moving to a more HTML 5 based solution means less IOS integration?
(Just musing through the top of my head)