I got the Nikon D300 lastnight, however i really havnt had a chance to get out and test it. I can tell you that it does handle low lighting pretty freaking well, the noise control is superb. I did an example of the camera at iso 100 and at iso 6500 and in some spots you couldnt notice a difference, in others you would notice the smallest amount of noise.
Ill have some example pictures up tomorrow.