The cover has the "Atlantean Edition" thing at the bottom, but the spine is also different in that it does not have the OGL grphic at the top of the spine and the bottom does not have the Mongoose "MGP 7701" in the little yellow-orange box. The map on the interior cover is differnt to the original printing, but easier to spot is that the masthead page (the first page with the table of contents and copyright info) is all Table of Contents and doesn't have Paul's and Ian's dedications there.
I found mine yesterday and I'm ecstatic...my best X-mas present so far...
8)