OEMs get chips before their street release. Nov. 12 is a rather arbitrary date for an update as well. Late October/Early November is a better guess. But it isn't dependent on the Intel releasing them on the street.
I'm hoping the new EA games (and the slew of complaints in the associated apple store comments) will open Apple's eyes more into better/more frequent video upgrades at least. Hopefully that's in time to make a difference in the next Mac Pro update.