Kostas
Dormant Watcher
That's certainly a danger, another one is the world being akin to the one of Gothic 3 which as much as I may now appreciate the game was nowhere near as dense as G1&2 and the best areas of the Witchers. What I really can't see them doing is managing to make the tremendous gameplay jump needed for Witcher 3 to reach the other even quasi-open world games in terms of interactiveness with the world* and increasing the scale by as much as they say.
*While RED managed to pull off incredible visuals in TW2 it didn't look like the sort of engine that could be used in an open world game. The most open area - the one outside the camp in Ch2 was technically more like a Bioware area than any open-world game I know of.