I found this article in the latest release of the AIX Systems Magazine: http://www.ibmsystemsmag.com/aix/trends/whatsnew/aix72-commitment/
Whilst I am encouraged to hear that IBM continues to develop AIX I cannot help feeling that they are now retreating within themselves and no longer talking to the rest of thie IT World as many of the new features can only be described as niche and not really relevant for the rest of us.
For me the killer feature of Linux is the ability to use tools such as YUM to download a product with a single command without having to worry about dependencies. That said there are still some areas where Linux us weak e.g. the lack of a mirrored boot disk, and mksysb.