Apple Insider posted a story that Apple has released an update for the new Macs for OS X Mountain Lion
While the download is called OS X 10.8.2, just like the most recent update to Apple's current operating system for all other Macs, Wednesday's release is "for 13" Macbook Pro with Retina Display, 21.5" iMac (Late 2012)Mac mini (Late 2012)."Apple releases OS X Mountain Lion update tailored to new Macs
A quick look at the release notes doesn't yield much in the way of new information, possibly pointing to issues the new 2012 units are facing with some features in 10.8.2. Of note is the update's compatibility with the 21.5-inch iMac, a model that has yet to be released, though the no mention was made of the 27-inch version.