Apple today released the latest in a series of Digital Camera RAW Compatibility Updates that are designed to add RAW support for new digital cameras to iPhoto and Aperture. It's available now through the Mac App Store Updates tab or downloaded directly here.
Digital Camera RAW Compatibility Update 4.01 is notable in that it is providing RAW file support for a number of the new Mirrorless Interchangeable-Lens Cameras (MILC) that have recently hit the market. In particular, the new Canon EOS M MILC and Nikon D600 DSLR are covered by the new update.
A full list of supported digital camera RAW formats can be found in Apple support knowledge base document HT5371: http://support.apple.com/kb/ht5371.