is Google identifying more full text works for GBS?

Barbara Quint at Information Today wonders -- Is Google Book Search Targeting More Books for Public Domain?

Pretty much no U.S. library will make post-1922, probably in-copyright digitized material from their collections available on the open web without varying levels of risk assessment that includes a review of copyright renewal records. Now that Google has developed its own copyright renewal data, will it use that data to identify works that should be in the public domain? And will they make those works available as full-text in Google Book Search? And will they share their research results with the rest of the community so we can free our digitized copies, too?