I am told there is only black and black with white for interior colors. I have driven 5 different isf and none of them have had brown or redrock interiors.My dealership contacted me yesterday because I am first on the list to buy one at a so-cal dealer.
He told me that the first batch of IS-F's are set to arrive in the Los Angeles port on January 30th, and to go on sale very soon after that.
And the Redrock interior rumor a while back is the real deal. The IS-F my dealership is set to receive is obsidian black on the exterior with the Redrock interior.
My salesman described it as a chocolate brown.
Here is a picture of a tundra with Toyota's Redrock interior.
Hope this information gets some of you excited!