This is the draft post for 3.6 Revisions overhaul. The original article is here: Revision Management
The Revisions UI received a big overhaul for WordPress 3.6.
Revisions are saved copies of your post or page, which are periodically created as you update your content.
From the revisions screen you can review, compare, and restore revisions:
Click the Browse link to open the revisions comparison screen.
The revisions comparison screen shows the previous revision on the left, and the new revision on the right. Using the slider at the top of the page allows you to "scrub" through the revisions, comparing each one to the next. The red text shows the content that was removed. The green text shows the content that was added.
A checkbox at the top right allows you to pick and choose which revisions to compare, splitting the slider handle into two parts.
Revisions screen after "scrubbing" the revision forward:
Any revision can be restored by clicking the Restore This Revision button.