RAINBOW’S END a “Zones of Thought” novel?

The Amazon.com catalog entry for Vernor Vinge’s much-anticipated novel, RAINBOW’S END, reads “RAINBOW’S END (Zones of Thought)”.

That would suggest a link between RAINBOW’S END and Vinge’s classics, A FIRE UPON THE DEEP and A DEEPNESS IN THE SKY.

Cataloging error, or humongous spoiler?

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