Hello there, my favourite company and community! Greetings from Serbia!
I will probably pre-order witcher 3 from gog.com, but since I have big steam collection, I would also like to know, if I decide to buy it on steam, will I be able to reedem code on gog.com just like it was possible with the witcher 1 and witcher 2.
Thanks

Nothing said about a free backup copy. I personally don't count on it. Check the FAQ for more info.

There is no information on this currently but GOG representatives have mentioned elsewhere in the forum that maybe closer to release or after release they will have an update on this.

I see.. It would be great to have the game in my two favourite game libraries with one buy. I hope this will be possible. :)