Want to Beta Test OS X Yosemite? Sign Up for the Official Beta Program
If you can’t wait until the fall to get your hands on OS X Yosemite, and you don’t want to cough up the $99 to get a Mac Developer Account just for the current Developer Preview access, Apple provides all users with a third option; joining the official OS X public beta program.
The OS X Yosemite beta program is limited to the first one million users who sign up, so if you have any interest in trying out the latest OS X version before everyone else and, perhaps more importantly, offering your own feedback of the beta release before things get finalized, now is the time to join.