There are definately graphite gray cars coming. I have seen two already in person.
I think initial production is roughly 10% so don't expect to see alot of them unless Lexus decides to start making a higher percentage.
As far as I am concerned, Lexus can stop making them in that color just as soon as I get mine!
I have heard from a number of different places that the "graphite polished" wheels are not available at first. I don't know how long it will take, but we may not see any of those wheels for a while. I ordered them on my car, so I will be sure to let is300.net know when I get mine. Luckily they stuck a set on the Yellow IS300 that was reviewed in Autoweek (for those lucky enough to have a copy). Also, we saw some pictures of cars which were delivered to the Lexus corporate offices - some of which had the graphite wheels. They do exist, but perhaps in very limited supply.