Here is the full cover to UDON's upcoming Mega Man and Mega Man X artwork extravaganza: MM25 Mega Man & Mega Man X Official Complete Works. With the full cover revealed, we can be assured that X is getting the same love and representation as the Blue Bomber himself. The suggested retail price is $59.99 for this 430+ page tome, but you can find it online for discount pre-order right now (see above link)!
Additionally, an update on the alleged hardback edition. The information from Diamond Distributors is apparently incorrect, and book stores will only be receiving a softcover version. That being said, a hardcover edition is in the works. This will only be available at conventions or directly from UDON Entertainment. The price is still undetermined.
Thanks for the intel, Matt!