There are some special upgrades coming
I know... but it seems that you have more inside info than I have, as the updates that I've heard of don't seem important enough to me to take it to the ring for a big test...
looks like the headlight looks different. The DLR is different too. Theres a sharp piece near the tip of the inside of the headlights.
EDIT: The RCF definitely got new rear wheel exhaust vents, even if they're non-functional.
Just like the IS F, it will probably get significant suspension changes that might slow it down.
That might explain why it's on the Nurburgring.