1. The document discusses the idea of books as bundles of content, structure, and format that should adapt to how they are being used.
2. It argues that the concept of a fixed "publication date" is misleading given that book content is constantly shifting, and books must be linked to outside information in the age of big data.
3. The future of books is seen as their application programming interface (API) that separates content from structure, allowing the two to evolve independently and be recombined in new ways.