This assistant to Lord Voldemort (and one of Harry's father's old school friends), who was largely absent from book 5, will reappear in Half-Blood Prince.
Asked in an online chat:
What about Wormtail? Is there hope for redemption?
J.K. Rowling: There's always hope, of course. You'll find out more about our rat-like friend in book six.
What happened to [Wormtail]?
J.K. Rowling: You'll find out in book six.
Will Lord Voldemort get more 'screentime' in the upcoming books?
J.K. Rowling: You will see him again, but like most evil dictators, he prefers his henchmen to do his dirty work.
(Source: Online chat transcript.)
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