I have this in mind particularly for teams which include external users, such as on a construction project. The external folks might fill out a Forms form requesting access to the Team, or perhaps there would be a spreadsheet sent from a partner org, listing people who should have access. Then the Flow would add members to the project Team without an admin needing to do that for each person - maybe the admin would just approve them as they come in.
I've noticed there's no "User Status" information available for Office 365/Skype for Business/Teams. I believe this would be a useful addition, as it could be used to drive automated emails from Flow. (User Status as in Free/Busy/Working Elsewhere/Out of Office/etc)
One example is a project I'm working on, where I'm trying to have emails with a certain structure (from a certain email address, with a certain subject line) auto-forwarded to my backup if I'm showing out of office at the time the email comes in. This flow would then be extended to my team, so that they will have these types of emails forwarded when they are out of office.
In addition to standard triggers for posted messages such as available for Yammer, but also requested for Teams here, it would be great to have a bookmark trigger.
For example: I use one location for all my reading material, whether it's a blog, documentation or a Yammer/Teams post that requests my attention/response at a later time. That location is Instapaper for me, but could also be Pocket for example for others.
It would be nice to be able to have a Flow trigger when I bookmark something in Teams or Yammer and have it add the link to that post in Instapaper.
It would be great if we could build a flow which allows an employee to ask for the creation of a team and if approved the team is automaticaly created even if the creation of teams is disabled for the "normal" employee.