There will be NO th3. The next Branch is rs1_release. If you are part of the Insider Program you can open Regedit go to this Key to see if it is listed. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsSelfHost\Applicability Don't expect a New Build until Jan. 2016. This is a thing with MSFT. They didn't release a Build during Dec. last year either
You didn't say. Are you part of the Insider Program ? That Key will only show for Insiders. You need that Key to download rs1_release Builds thru Windows Update.