According to the official notice (http://www.gog.com/en/page/witcherbackup) you claim the full GOG.com version of the game with all the premium extras too, basically its a DRM free copy for your GOG.com account for those who have retail copies or DRM online ones like from Steam.

I know that, I'm just curious if polish version will be included. GoG version of Witcher 1 has a sweet multi-language with polish subs and voiceover, unfortunatelly Witcher 2 does not include this. DRM free backup would be cool, but I'm not gonna play it in english. Any word to polish fans GoG?

I thought you could download the languages in audio/subtitles that you want optional though the game itself, at least I had this option with my retail copy not sure with my steam copy though.

The version on GOG comes with this:

Dubs: English, German, French
Subs: English, German, Spanish, French, Italian

You can set these by going into the options when you open the launcher.

You can download the following dubs from here: English, German, French, Italian, Polish, Spanish

http://en.thewitcher.com/support/#q29

I do not know whether they also include subtitles, but I think they do.

As for the Russian language pack, that's Steam only I guess. It would be awesome if all possible language packs were available through GOG though.

Thanks for the information about downloadable language packs.

wait is there also the czech version
CZECH SUBS

my brother registered it but it didnt appear in the library for now