The original Witcher, released in 2007, was a fairly linear affair, with individual maps to explore but overall progression, from point to point to point, relatively tied down. The remake, in development at Fool's Theory, is taking a very different approach: It's a "modern reimagining" of that game as an "open-world RPG." Simple enough—just make it like Witcher 3, right?
It's really not that simple at all, as Witcher and Witcher 2 designer Artur Ganszyniec explained to Polish site Chip. Going open world means there's more space that has to be filled with things for players to do, and developers also have to figure out how to make all that new content work with the old content, while simultaneously figuring out how to make the old content work in ways it was never meant to.