I just received a notice from Nikon Europe about new FW update from A1.02 to A 1.03. B FW has not been changed.
I downloaded the FW and updated my D700, no issues whatsoever. What I would suggest is that you save your settings prior to updating the FW and to load the same setting into D700 after updating. Just in case...
I also noticed an underexposure on my D700 a couple of times, no big issue, I hope that now the exposure will be even more consistent.
I find Nikon policy about updating the FW on "old" cameras after a new model (D800) has been released, a good customer care policy.