So every game always includes everything shown in trailers during the game development?
In my experience, rarely, if ever, is all content debuted in a trailer or during the game development life cycle included in the final product.
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You haven't seen many E3 demonstrations then. Even the fake one for Killzone 2 was recreated in game. This game was way past proof of concept stage when they showed it. They made the same promises in every vidoc and demonstrations all the way up to release. The evidence is out there and easily accessible on YouTube.
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Just because it's shown in a vid before release does not mean it's guaranteed content..