Thank you for this amazing thread.
According to InsideLine:
"There are two new structural braces ***8212; one carbon-composite brace mounted along the firewall between the shock towers and another dashboard-support member which is part of the car's body structure and is oriented vertically on the inside of the firewall."
2012 Nissan GT-R Full Test and Video
Is that what this picture is?:
Have you come across this second brace that they speak of?