Released Mar 3, 2pm from this Facebook account: https://www.facebook.com/thewitcher
I can't see that account either without registering apparently. Are they published by CDPR anywhere besides Facebook?
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Ah, I see it was reposted here too: http://forums.cdprojektred.com/threads/30509-Screenshot-amp-Artwork-collection-Part-II
I didn't really track that thread before.