Ghostcrawler posted an update in the tanking forums about the new AOE swipe that got put on the PTR recently:
The correct range for the new, 360 Swipe should be 8 yards. It appears to only be 5 in your version of the data.
This means that it should roughly be the same as the other tanking class’ AOE tanking ranges, which is an acceptable range. The current PTR version (that people have been complaining about) is basically bugged. It should be fixed in an upcoming build, and the correct version will likely make it live for 3.1.