Many thanks to Ayako for tweeting the link!
Jeff Vespa posted one of the solo portraits that he took of Keanu at Sundance on his tumblrpage a while back that I posted from here. Three additional portraits have shown up on Getty Contours that Mr. Vespa took for Weekly Entertainment Magazine. It is not clear if they will be used for some future issue or if they have already been used. Regardless, the photos are here.