Evidence suggests Apple at work on Mac OS X 10.7
Apple is unsurprisingly already at work on the next version of its operating system, according to a new technical message that references Mac OS X 10.7.
As first discovered by MacRumors, a new database entry for the open source "launchd" framework responsible for booting Mac OS X references "11A47" with a new error message. Based on Apple’s numbering scheme, the numerical prefix of a Mac OS X build determines the version number, and 11A47 would suggest a reference to the next version of the operating system, Mac OS X 10.7.
When it shipped, Mac OS X 10.6 Snow Leopard carried the build number 10A432, and subsequent updates 10.6.1 and 10.6.2 had the prefixes 10B and 10C, respectively. For Mac OS X 10.5 Leopard, 10.5.0 builds leading up to launch were represented by the prefix 9A.