"I've been wondering if Apple, on their Jan. 26th product announcement, won't start to differentiate OS X to include OS X Mobile, OS X Touch, OS X Desktop & OS X Server. But rather than discreet versions of the OS, it is a spectrum where features of one version can slide up and down the scale depending on the functionality of the hardware platform it's running on. It seems to be moving in that direction whether a formal acknowledgment is made or not."
http://www.tuaw.com/2009/12/27/could-apple-be-moving-to-a-spectrum-of-operating-systems/