Seen above is supposedly an early concept for the hugely popular Artist's Edition. This image, with its dreadful title font, appeared late last year on message boards. To the best of my knowledge, no copies of the actual book ever had this image.
This one was the cover as solicited but as far as I know there are NO copies out there with the light blue as it was changed to the orange below by the time it was printed and shipped.
Seen below is the First printing variant cover, a limited number of which were made available at a convention after the main edition had sold out so quickly and unexpectedly. It is still a First printing, not the Second.
Finally, shipping now are Second printing copies featuring the cover below with the pea-green color. No word yet if there is or will be a variant cover for the Second printing.
The book is copyright by IDW, the art copyright by EC and Wood's trademark signature is a trademark of Wallace Wood Properties, LLC