On Thursday, fall will come early for hundreds of thousands of
Mac users when Apple releases its first public beta of OS X
Yosemite. The public-beta program, announced during Apple’s
annual developer conference in June, lets regular users download
and test pre-release versions of OS X. Apple says the first
million users to sign up at the OS X Beta Program website will be
able to test Yosemite before the OS is released to the general
public in the fall. […]
When Yosemite is finished, users will be upgraded to the final
version automatically, also via the Software Update feature within
the App Store app.
Just as a reminder, OS X Yosemite is still software that is under
development, so apps and services may not work as expected some
(or all) of the time. It’s always wise to back up your Mac before
installing, and you should seriously consider installing Yosemite
on a Mac that you don’t use for day-to-day operations just in case
something goes wrong.
Good advice. Judging by the developer betas, Yosemite is in good shape for a beta, but that is not the same thing as being in good shape for production use.