People, relax. It's just a marketing stunt. Worse one ever. I don't know who at CDP thought this was a good idea to drop the beta and go final in such manner, but he's a moron.
And yes, it is a stunt, CEO warned financial forums couple days ago to ignore what will appear on Gog site soon. .t. It's a mess overall...23rd there was supposed to be full blown conference (like the one in Spring, when they've shown Witcher 2 for the first time), but it was just annouced it won't happen and there will be online conference instead.
Anyway, bassicaly GoG is simply ending it's beta phase and going final, that's all. Some speculate it will get a standalone client too.