Last week I was in the UK talking with a colleague about what the future of electronic books will be.
I believe that this paper is addressing in a more abstract way than my talk about an abstract page for books or book-parts, one of my key points.
The point is that scholarly works need to be citable and addressable. (I am hugely antagonistic of IRs which are mentioned and seem to be foundational to the ORE technology)
And I think this is in some ways on on the topic of what he thinks is important about updates to a book.