Hi Helen, Oh yes, there will be a volume 57!
I've been BCing the Nonfiction Collection since vol. 029 (cataloged May 5, 2013), and I'm still enthusiastic. Craig (Soupy) has been around as DPL (dedicated proof listener) for a long time too, (I think since Vol.039) and knotyouraveragejo (Jo) has been metacoordinator since the beginning. Jo started the nonfiction collection in 2007. Volume one of the collection, cataloged August 23, 2007, has been viewed 126,618 times!