So they posted some new stuff on gog.com and gave a link to this YouTube video:
After quickly analyzing the video you can see a bunch of new features like GOGMix and some UI changes along with new title – Baldur’s Gate The Original Saga – which was not on GOG earlier and was anticipated by thousands of players. So it seems that GOG is expanding somehow and possibly changing from BETA to stable version along with small UI changes and store features.
I wouldn’t call that a good campaign. I still haven’t heard from their promo management.