I think it would be useful to save a specific version of a page in Coda for revision tracking. For example, I would draft a page and then save that version. Then I would create a new version to revise the draft. Once I finish the document, I could save each future revision for document control and to see the history of the document in my saved version snapshots.
Currently, I find myself creating a new page altogether, when really I am trying to revise the same page. I think it is important to clearly see the history of a page with a revision history where you can save specific versions for future review.