The D5200 is a relatively inexpensive SLR whose 24-megapixel sensor looks to have promisingly high performance -- the top rating for an APS-C-sized sensor, according to DxO Labs' DxOMark test results. The $2,800 RX1 has an even larger full-frame sensor, also with a 24-megapixel resolution, but its design uses a fixed 35mm lens.
Also supported in the Apple update is support for raw photos from Pentax's K-5 II and K-5 IIs, which also get high marks from the DxO sensor test.
Apple has been turning the crank faster to keep up with the constant stream of new cameras, with eight raw support updates in the last year. Each update means that software such as iPhoto and Aperture that rely on OS X's raw-image support can handle newer cameras' formats. Raw photos, available on higher-end cameras, offer higher image quality and more flexibility than JPEGs, but they also require some manual processing that makes them less convenient than JPEGs.
Also supported in the update are Leica's D-Lux 6, V-Lux 4, and X2, and Pentax's Q and K-30.