The announcement (http://googleblog.blogspot.com/2011/06/knocking-down-barriers-to-knowledge.html http://googleblog.blogspot.com/2011/06/knocking-down-barrier..

The announcement (http://googleblog.blogspot.com/2011/06/knocking-down-barriers-to-knowledge.html http://googleblog.blogspot.com/2011/06/knocking-down-barrier...) says it uses a feature available in the next chrome beta (see here for the technical details: http://www.chromium.org/developers/design-documents/prerender http://www.chromium.org/developers/design-documents/prerende...).