What comes after the Tiger OS and when will it be released?
Version 10.5, codenamed Leopard, is the next scheduled version of
the operating system. Originally scheduled for a Spring 2007
release, it was delayed until October so Apple could focus its
engineering team on the iPhone launch in late June. Apple released
a feature-complete beta version to developers at the 2007 WWDC
(World Wide Developers Conference) in June.
Mac OS X 10.5 'Leopard' was released on October 26, 2007.
Any customer who purchased a new Mac between October 1, 2007 and
December 29, 2007 that did not come with Mac OS X 10.5 'Leopard' is
eligible to purchase it directly from Apple for $9.95US via the 'Up
to Date' program.
The most recent version of the Mac OS is10.6 known as Snow
Leopard. Sometime in July of 2011 Mac will release Lion.