We don't have any immediate plans for Revolution R Open regarding GPU support, but there are a number of R packages that implement GPU computation from R, including:
http://mran.revolutionanalytics.com/packages/info/?gmatrix
http://mran.revolutionanalytics.com/packages/info/?gputools
http://mran.revolutionanalytics.com/packages/info/?magma
http://mran.revolutionanalytics.com/packages/info/?rpud
http://mran.revolutionanalytics.com/packages/info/?gmatrix
http://mran.revolutionanalytics.com/packages/info/?gputools
http://mran.revolutionanalytics.com/packages/info/?magma
http://mran.revolutionanalytics.com/packages/info/?rpud