The Witcher 3: Wild Hunt trailer explains the scope and size of the setting
This is technically a development diary, expanding on the world of The Witcher 3, and its ecosystems and politics. But given that it's set predominantly around old ruins, there isn't much actual development to be seen. Unless, that is, CD Projekt RED make their RPG sequel by chanting near ancient groves and resonating structures. If nothing else, it would explain the delay.
The Witcher 3 is due out 24 February. Plenty of time to start planning your PC upgrades.
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