I did some initial tests on focusing in the shadows. It appeared a bit faster to start and finish the hunt.
Then I put the new 50mm f1.4 AFS-G lens on. This didn't really focus any better than the original 50mm f1.4 AF lens. But after the firmware upgrade, this lens now focuses much quicker. The way I was hoping and expecting it too.
Thank you Nikon!
I just finished upgrading the firmware on my D3 and D700 (to v2.1 and 1.1 respectively). One of the things this is supposed to address is auto-focus in dim lighting.