Thanks to listings from Amazon, the first details are now available for The Witcher 3: Wild Hunt Collector’s Edition: Prima Official Game Guide along with The Witcher 3: Wild Hunt: Prima Official Game Guide. You can preorder the two at the retailer’s website with the next links: hardcover collector’s edition and paperback regular edition. Take a look at the covers below this paragraph (keep in mind that the art for the collector’s version is not final). 
The Witcher 3: Wild Hunt Collector’s Edition: Prima Official Game Guide has an ISBN-10 of 0804162980 and ISBN-13 of 978-0804162982. It contains 448 pages, 48 more than the standard release, with bonus content such as artwork from the videogame.
Otherwise, the two versions of the official The Witcher 3: Wild Hunt strategy guide should be the same in terms of content. Amazon lists that both have maps that show all important areas from the massive open-world setting. The books will also highlight how to unlock every achievement, trophy and all 36 different endings. Last but not least, a free e-Guide is also included in the package as you can search through tables, interact with maps and view video walkthroughs.
The paperback version of The Witcher 3: Wild Hunt: Prima Official Game Guide is tagged with an ISBN-10 of 0804161593 and ISBN-13 of 978-0804161596. The standard release, along with the collector’s edition, is launching on the 19th of May.
Of course, the videogame is also coming out on the same day. The sequel is releasing simultaneously for the Xbox One, PlayStation 4 and PC.