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Phasing is the new instancing
In an interview with Eurogamer, Blizzard's J. Allen Brack revealed just a little more about the advancements developers have made with Wrath of the Lich King. As I raved about in my post about the Death Knight starting experience, I effused about how the entire experience was instanced, creating a feel of progression through the world. It turns out I was wrong. The Death Knight starting experience isn't instanced at all. It uses what Blizzard calls "phasing technology". In my defense, even Tom Chilton made the same mistake in the interview, saying "(the Death Knight starting area uses) instancing quite a lot more... the world changes dynamically as you move through the story." This prompted Brack to interject a correction, "It's actually not instances. What we do is we have different world states, and depending on what quests you've completed, it changes what world state you're seeing." He also mentions that the new phasing technology is used in other parts and other quests all over Northrend.
