Microsoft have released update 1606 for ConfigMgr Current Branch. You can update directly to version 1602 from version 1511, or you can update from version 1602 to 1606.
If you cannot find the update in \Administration\Overview\Cloud Services\Updates and Servicing there is a PowerShell script here you can run which will make the update available. It worked for me.
What’s new in version 1606 of System Center Configuration Manager