The long waited new version (and unique tool) to synchronize your On Premises Active Directory with Azure Active Directory (and so Office 365 too) is now available 
This new version offers more options for the synchronization such as multi AD Forest support, simpler attributes selection for synchronization, richer identity scenario…
And the icing on the cake, you can upgrade from the “old” DirSync
To know more go to http://blogs.technet.com/b/ad/archive/2015/06/23/azure-ad-connect-amp-connect-health-is-now-ga.aspx
By the way, in the meantime, Microsoft has also announced the availability of AD Connect Health which offers you a cloud monitoring for your identity infrastructure – as part of this first release, this applies to ADFS first (you must also have an AAD Premium)
Enjoy