Amazon has updated their Mega Man Official Complete Works page to include the book's cover art. What do you think? Not too vastly different from R20, isn't it?
As a reminder, MMOCW is set to release on October 14th, 2009 for 39.99 ($26.99 through Amazon). The second volume, Mega Man X: Official Complete Works is coming down the pipe with an expected November 2009 release. Amazon has yet to set up a pre-order page for the book.
EDIT: Just spotted X and Vile on the cover. An indication that some MMX material will be in the book? Perhaps a simple mistake?