The Book of Dust will continue the story of Will and Lyra.
No, Pullman has said the Book of Dust will not be a continuation of the His Dark Materials trilogy, but a companion novel to His Dark Materials.
The Book of Dust will tell us more about the history of Cittagazze.
Unconfirmed, but likely, as he has said that the Book of Dust will give information about the history of the Subtle Knife.
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