This depends on when Nikon gets around to updating the drivers. It's Nikon's responsibility, not Apple's or Adobe's. Unfortuantely Nikon doesn't have a stellar record of supporting their software or drivers on OS X.
In the meantime you can always shoot JPEG and import that into Aperture. If you shoot NEF+JPEG you can import just the JPEGs into Aperture now, and later on import the matching NEF files. You could also use ViewNX2 to convert the NEF files to TIFF. At least until Nikon gets around to updating their drivers for the 7100 for Aperture & PSE.