How to turn a concept description into technical documentation.
- Make it clear what works and what is still a concept.
- Explain why does this app/module/feature exist.
- Use cases. List them, don't try to write them out.
- Extension points. How is this app/module/feature used by other apps?
Think like a non-Magnolia developer!
Finally, move the page under the Changelog: http://wiki.magnolia-cms.com/display/DEV/Changelog+-+5.0