That wasn't a firmware update... that was custom picture controls that could be downloaded.
Here's the main link I usually check for Nikon's software.
And here's the link for Optional Picture Controls, and yes, there are downloads for the D700 for the Landscape, Portrait and D2X picture control files. Unless you are coming from a D200 or D2X, I would ignore the D2X picture controls that simulate Mode I, II and III from the older cameras..
George, The software version of the picture controls are only useful if you are shooting raw and using Capture NX2 for post processing. If you are shooting JPG, the picture control settings get "baked into" the JPG produced by the camera. For NEF files, the picture control settings get saved as part of the information in the NEF and they affect the embedded preview JPG.
So, if you are shooting raw and not using Capture NX2 or you are shooting JPG, the picture controls for the software won't do anything for you. The new camera profiles for ACR is Adobe's answer to Nikon's picture controls except that they can't be loaded into the camera.
Technically, you could load the firmware updates onto two separate CF cards and load them into the camera the field too.
I'm not sure why you would want to keep the picture controls on a CF card to load them in the field. Once you load them, they are on the camera until you unload them. It could be useful if you have generated a bunch of your own picture controls and have too many for the camera to hold at once, but I haven't heard about anybody who has done.