since it'll probably going to take a few more days (maybe weeks) before GTX480 will be really available, I asked some professional hardware reviewers at Beyond3D with GTX480's to do a benchmark with Octane. These are the results:
For chess, I'm getting 12.75 MSamples/sec., for spaceship 15.96.
http://img222.imageshack.us/img222/6558/octanedemo07a9000gtx480.png
http://img13.imageshack.us/img13/6558/octanedemo07a9000gtx480.png
http://forum.beyond3d.com/showpost.php?p=1419633&postcount=342
3-4x faster ! Woooot! Go Octane!