Nissan has announced two S-Tune packages for the new 370Z that will be available directly from dealers as soon as the 370Z arrives.
The first one will be the Nismo S-Tune Aero Package, which is focused, as the name implies, on an improved aerodynamic performance. It includes a front protector, side skirts and a rear spoiler to improve airflow around the car, increasing downforce and eliminating lift. There is an extension nose piece -- a stylistic reference to the long bonnet of the old 240Z. It also comes with Nismo floor mats, which is really what you want to spend all this additional money for.
The second is the Nismo S-Tune Performance Package and this is the one that includes the treats for a more exciting ride. It comes with Nismo Stainless Exhaust to provide better response and give the engine a more rumbling soundtrack. There are Nismo LMZ5 19" wheels, new break pads and S-Tune Suspension which upgrades the springs and dampers for tighter control on those winding roads.
And yes, this one comes with the floor mats too. Pricing details still not available.