I attended SharePoint Saturday Event in Stockholm, you can read more here http://www.spsevents.org/ and http://www.spssthlm.org/
One of the things in which a lot of people were interested and I also get to know was about Private Channels in Microsoft Teams. Currently we are able to create Channels but they are not private and can be accessed by all Team members.
Apparently this is the most sough after feature in Teams in User Voice. Latest information I got from two guys from Microsoft in a session about Teams was Private Channel will be available in end-October and might be available in Nov to Tenants
Interestingly the Private Channel will have it’s own SharePoint site collection and not as a folder in existing SharePoint site as it happens now. It will only have four Apps available to be used in beginning for rest of Apps you have to go to main Team.
As explained to me is that idea is to get the Private Channel usage going and then later more Apps will be made available.
Some people were concerned with new Site Collection being created for each Private Channel but this seems to be logical as we do not want permission broken folder in our library as it will be a nightmare for future and having a site collection of it’s own makes it scalable.
Keep an eye here when it is available and also on User Voice page https://support.office.com/en-us/article/create-a-private-channel-in-teams-60ef929a-4d68-418b-bf4f-5784db184ec9