For those who are interested, it appears to be getting a 3DMark 11 of around P6700 or about 10% faster than a desktop GTX580. http://www.notebookcheck.net/NVIDIA-GeForce-GTX-680MX.83519.0.html
Not bad for a mobile card (especially for a TDP of sub 125W) but compared to desktops its a generation and a half late given that the new cards will appear in 3 or 4 months time. Of course, driver improvements may increase its performance somewhat. Still a beast for what it is, really.