There already are tools that can colour the text of article showing how old or new (or change-resistant, or controversial, or important - if proper metrics are discovered) the section or sentence is... Basically all kinds of interesting meta-information could be overlaid with the article text, by examining article change history; and at some point - will be. The text-body of article is only a single dimension, but quite a lot of other information waits to be discovered and overlaid.