The Windows 10 Rollout - The Latest From Microsoft · 8:01am Jul 31st, 2015
So at around 2am Central time (an hour ago as I post this), I received a new e-mail from Microsoft.
It reads as follows:
This essentially confirms what all the tech news websites have been saying: while the launch date of Windows 10 was July 29, it could be mid to late August before every Windows user has received the upgrade.