Nik ships Viveza as an Aperture editing plugin
With Viveza photographers are able to select areas from their images and adjust them separately from the rest of the picture by defining so called Color Control Points.
A 15 day trial is available from the website of the plugin. The whole plugin will cost you US$ 249.
Now it should be just a matter of days or weeks before the other recently announced plugins will be available too.
Finally here’s a first test of the plugin from photographer Jim Crotty: Testing Viveza and Your Opinion