It allows you to show the preview for every revision.. Normally, you can see the differences between revisions, but only looking at the source content.. The revision ouput depends not only on the content stored in the database, but also on the way your plugins and theme are manipulating the content.. The preview shows you how the revision would look on front-end if you restore it, but it may be different than how it was on front-end when you created that revision.. Click on that icon to see the revision preview on front-end.. The version allows who clicks on the preview icon to see the revision of front-end. So if you share the revision link to someone else, it will not work... Upload the entire show-preview-for-revision folder to the wp-content plugins directory or install it using the in the Plugins administration page.. Activate the plugin through 'Plugins WordPress.. Interested in development.., check out SVN repository, or subscribe to the development log by RSS...
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