It looks like Microsoft has scheduled Thursday, July 9 for its RTM sign-off summit in Redmond. Confirmation of that date is now coming from WZor, Zac Bowden at WinBeta, and Brad Sams at Neowin. The RTM sign-off is a meeting and a process behind sealed doors -- something like a papal conclave. The big difference is that we won't necessarily be treated to white smoke, and it can take days to filter through the results of an RTM meeting.
Once approved, there's no way to tell how long it will take for the RTM bits to make their way to the outside world. Given the recent Partner Build sieves, a leak seems likely to me, if the official RTM version isn't passed out through normal channels.
Given Windows 10's recent rollout history -- three beta versions in a four-day work week is quite an accomplishment! -- I wonder if Myerson will let sufficiently motivated Insiders get a sneak peek.
The just-released, rumored RTM candidate is 10.0.10176.16384.th1.150705-0552. The date stamp says it was compiled on July 5. Note that it's from the th1 branch ("th" apparently stands for "threshold" which, you may recall, was the old code name for Windows 10) instead of the fbl_impressive branch (which includes all of the recent beta releases) or the winmain branch (traditionally the home of the "real" Windows).
Will 10176 make it to the Insider Fast Ring? Will it be leaked to the Insider Ludicrous Ring?