The beta release is available on Connect from this link:

https://connect.microsoft.com/site433/Downloads/DownloadDetails.aspx?DownloadID=53361

Make sure to read the updated installation guide and release notes available on TechNet:

http://go.microsoft.com/fwlink/?LinkID=393942

Please continue to provide feedback through Connect. This allows us to deliver a high-quality product which is solving your scenarios.

               On behalf of the AAD Sync team,

Andreas Kjellman
Program Manager, Active Directory Identity & Access Management - Sync