Rob Galbraith has noted that Apple updated their site and will be offering all owners of Aperture a free update to the Universal Binary version.
A Universal version of Aperture, which will run natively on both PowerPC- and Intel-based Mac computers, will be available before the end of March 2006. New and existing owners of Aperture will be able to crossgrade to the Universal version at no additional charge via Software Update.
Aperture was recently released in November 2005.