While the new OS X Beta Program for Yosemite is unique for Apple, there is a bit of a downside.
According to the program’s site, it is limited to the first 1 million registered users. Even so, it is still a great way for non-developers to take a look at Apple’s latest OS X software.
Joining the progam is as simple as entering your Apple ID. When the beta is ready for users, you’ll receive a redemption code that can be used in the Mac App Store. When you run into a bug, it can be reported with the Feedback Assistant Application.
And if you don’t already know, there are some other things to consider before joining the program. More from Apple:
Be sure that your Mac is running OS X Mavericks. If you don’t have OS X Mavericks, you can download it free from the Mac App Store. We recommend installing OS X Yosemite Beta on a secondary Mac, since it may contain errors or inaccuracies. Please be sure to backup your Mac using Time Machine before you install the beta. Since the beta software is unfinished, some new features will not be available, such as phone calls, SMS, Handoff, Instant Hotspot, and iCloud Documents. Spotlight suggestions are U.S.-based only. Some applications and services may not work properly with the beta software. If you are using iCloud Documents on Mavericks and you are also a member of the iOS Developer program, your documents will not sync across your other Macs and iOS devices
Yosemite will be available to the general public sometime this fall for free.