Microsoft
By way of explaining why "Coming Soon" isn't available on qualifying builds/channels of Outlook, can you maybe translate https://answers.microsoft.com/en-us/msoffice/forum/all/coming-soon-gone-in-1601101020002/44944234-4215-447d-bb3d-2bd36e037597 for me (note that the comments were made in October, which was very early in the process)? I don't understand it, and while it may not matter in the near term, "Coming Soon" will surely rise again. As you'll see, it clearly conflicts with the idea that if you're on channel X or build Y, you will have the toggle. It seems that it's more gray than that.
"Coming Soon will only be shown when there is a feature available that is part of the "Coming Soon" experience. If you are on a build that does not have any new features that fit into that experience, the toggle disappears. It will show back up again once there are more features that fit into that experience."
"If there isn't a feature being tested in your ring (Fast or Slow) that falls into these categories, or if the features that were in Coming Soon have been turned on for everyone without the option to turn them off, then the toggle will not show. As the new UX is now rolled out broadly, it is no longer a part of the "Coming Soon" feature set. There are not any other features currently in Insider Fast that change the look or feel, or functionality changes that can be toggled, so the toggle is not showing."
"The new UX rolled out to Insiders Slow in the 1809 build (see the What's New page with that information https://support.office.com/en-us/article/What-s-new-for-Office-Insiders-c152d1e2-96ff-4ce9-8c14-e74e13847a24) as well as production users (see https://support.office.com/en-us/article/what-s-new-in-office-365-95c8d81d-08ba-42c1-914f-bca4603e1426?ui=en-US&rs=en-US&ad=US.) I do personally see the UX. Also, as with all Insiders features, things may come and go from build to build, may show up for some users and not for others. Things like Coming Soon are dynamically controlled based on what is available to you. "
