I've just seen the artist steelbook of the game and i have to say they are amazing. But is not clear for me if this steelbook is coming only with Collector Edition or with Standard Edition too. Anyone know about this?

Here the different covers:

http://studiokxx.com/The-Witcher-3-Steelbooks

It would be nice to order collector's from GOG.

Series of artworks created for Limited Edition Steelbook covers for the next generation genre-defining video game The Witcher® 3: Wild Hunt.

Source - the link you posted ;)

Righ, I guess Limited Edition and Collector Edition are the same, but take a look of this (it's the The Witcher 3 card in GAME UK):

The Witcher 3: Wild Hunt Standard Edition

For those that want more than the disc and manual, The Witcher 3: Wild Hunt standard edition contains premium items for the dedicated gamers and fans of The Witcher. For new comers to the series this is a great way to enter the Witcher Universe in style.

Standard Edition Includes:
• A Copy of the Witcher 3: Wild Hunt
• An exclusive CD with the official soundtrack
• The official, developer-created "Witcher Universe - The Compendium"
• A beautiful, detailed map of the in-game world
• A set of unique Witcher 3 stickers
• A stylish, protective sleeve
XBOX ONE PS4 PC

Is this stylish sleeve the steelbook or a simple box for the discs? In the first case, the steelbook coming with the standar edtion too. Sorry if this is a silly question, but I've looked up several sources and it isn't clear.

Thanks for your help!

A sleeve is a plastic or paper "pocket" you simply slide the disc into.

Ok. Thanks for the clarification.

So: Will different collectors editions get a different artworks? Or will just four of them be used? I´m just askting cause a regular steelbook only got four sides to put Artworks on them!
:D

My personal choice would be #2 (Ciri) and #6 (Triss &Yennefer) on the outside and #4 & 5 for the inner part! But I´d be fine with any selection, they are all nice work!