The 2013 Subaru Impreza WRX and STI models both carry over in sedan and hatchback body styles with no significant styling changes versus last year.
2011 had been a big model year for these models; that's when the WRX got the wide-fender look that had been previously reserved for the top-performance STI. The WRX and STI remain divorced from the more pedestrian Impreza, which got a long list of changes last year that made those models more unanimously good-looking--albeit in a more mass-market kind of way.
As for these performance models, they still definitely stand out, with their performance-look front-end aerodynamics, quad-tipped exhaust and, on sedan models of the STI, an available (and large) wing. We tend also to think that hatchback model wear this performance treatment a bit better, with a nicer stance, although Subaru did work to give sedans more 'pop' with the latest refresh.
Upgrading either the WRX or STI to Limited status adds leather-trimmed seats and upholstery and a slightly more under-the-radar exterior.
The WRX and STI don't get the mostly new interior--with more soft-touch surfaces and a lower beltline--that was given to the rest of the Impreza lineup either, so for the time being these two models feel a bit more dated inside. The instrument panel is definitely an improvement over that of previous WRX models, but it still feels a little spartan and generic compared to other performance cars, especially in the STI's price range. STI models do add Alcantara (faux-suede) upholstery, logo stitching and badges, a unique STI steering wheel, and footwell lighting.