I meant continuity with the games, not the books (which were nowhere near as successful as the games unless I'm mistaken). They hadn't expanded upon returning characters etc. until fairly recently which led to tons of speculation. Commenting the engine is largely pointless because you cannot verify how much of it has been rewritten. As for combat, there's a pinned thread for it so I'm not going to derail this one.

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Which things?

A certain senior designer, see my last sentence.