20-inch wheels with wider rear track, a four-way extending rear spoiler that could give a Mitsubishi Evo spoiler envy and Sport and Sport Plus modes (just Sport was not enough?) that reset engine and suspension tuning, including extra turbo boost for a temporary torque peak of 590. Dynamic chassis control and torque vectoring for the rear wheels is part of the package.
Porsche said the fuel ratings are not official yet, but should be on par with the 15 city/23 highway/18 combined of the non-S Turbo.
If you really want to show off that you have an S, there will be an exclusive color scheme for the interior leather available (black/cream) and one of the paint colors (gray metallic) will be S-only.
Porsche being Porsche, expect a batch of a la carte options, too.