All those who signed up for the public beta can log in to the beta site and download OS X Yosemite now. The download is around 5.07 GB and seems to be newer than the earlier developer preview.
For people interested in checking out and participating in the public beta of Mac OS X Yosemite, you can sign up for it on the OS X Beta Program Site.
Only the first one million sign ups will be accepted. So, hurry up if interested!