Apple has already made it known that the OS X Yosemite will be released this fall, and it is expected to be launched any day now. In particular, reports have been pointing to a possible launching on Oct. 21, the day when Apple is expected to carry out another major event.

On this date, fans are looking forward to another set of offerings from the tech giant, including the new iPad Air, Mac mini, and iMac with Retina display. At the same time, Apple users are also looking forward to the release of the OS X Yosemite.

The operating system was first released for registered developers last June, and a beta version for the OS was launched in July. As the Yosemite is expected to be released late this October, speculations have also centered on an extended beta testing period following such release to aid Apple in getting rid of bugs and fixing potential issues.

The company, however, has not been specific about Yosemite's release date despite the OS being in its third public beta version. An eighth Developer Preview version has already been generated. This has then prompted Apple users to look forward to the Gold Master version before the final public launching.

Yosemite's predecessors have had a history of being announced first, a couple of months before it is made available to the public. The OS X 10.7 Lion, for instance was first unveiled in October 2010 before users were able to get their hands on the said OS in July 2011.

The following update, the OS X 10.8 Mountain Lion, was released in July 2012 -- five months after it was announced by Apple in February 2012. In 2013, the OS X 10.9 Mavericks was first unveiled in June before being publicly launched four months after.

Looking into these, reports are suggesting that Apple will follow a similar time frame of publicly releasing the upcoming OS update several months after its official announcement.