Here’s where I spelled out an idea of what we need in order to do really high-end book typography for dynamic, responsive, adaptive pages:
http://johndberry.com/blog/2012/03/06/what-is-needed/
Unfortunately, it’s all still in the imaginary future.
So far.
Terrific. Also! I think there needs to be more accommodation for dynamicism. A book should have the ability to pre-cache external links to images, real-time data, etc., as well as graceful fail overs if the data wanted is unavailable–not just error messages, but maybe the data it was able to get last time, or a little haiku from the author about what would be there if there was connectivity.