Developers have received devkits in stages, so some have earlier revisions at this point than others. On record, Guerilla, makers of Killzone said they've had dev kit(s) since November and Epic seems to have had theirs for 2 months now. nVidia is still working on the final GPU hardware, so all of these devkits use dual GeForce 6800 GPUs right now. The final GPU (RSX) is supposed to be done before year-end.