Posted in the nvidia forums a couple days ago....just an FYI for those waiting.
NVIDIA Forums Technical Advisor
We should be releasing a newer driver within the next couple of days but it is still from the 197 branch. This driver provides better compatibility with the game APB.
This is not an official statement, more of a personal guess but I would say in the next 2 weeks , the R256 driver will be released based on the time it will take our QA team to do a full run through of our internal tests.