From today's Microsoft blog post:
Starting today the Windows 10 Anniversary Update will begin rolling out for our customers around the world. The Windows 10 Anniversary Update is full of new features and innovations that bring Windows Ink and Cortana to life; a faster, more accessible and more power-efficient Microsoft Edge browser; advanced security features; new gaming experiences and more. The Windows 10 Anniversary Update will start rolling out to Windows 10 Mobile phones in the coming weeks.
So there we go. Comments welcome, though I doubt this will surprise anyone else here. We have the Fast ring Insiders builds to keep us going with the very latest code and the last thing Windows 10 Mobile needs now is a premature release to production Lumia 550, 650, 950 etc, let alone all the masses of upgraded Lumia 640, 735, 830, 930 etc.
Don't worry, we'll report on the full rollout as and when it happens for real. My guess is mid-September 2016. And even then I fully expect the 'native' Windows 10 phones to get the update first, followed a few weeks later by 'upgraded' (via Upgrade Advisor from 8.1) older phones.
PS. After all, if this is truly an 'Anniversary Update', remember that Windows 10 Mobile isn't yet a year old - technically!