This feature is still in the backlog.
-WarrenOwen Wetherow commented
I have teams with content that have different rates of change.
Slow Change (Quarterly to Annually) - I have a business unit team whose structure changes very slowly so for the General Channel I would like to make the Wiki the default tab but I still need for people to be able to collaborate within the space and to store relevant documents.
Medium Change (Monthly to Quarterly) - Product Families that need regular maintenance Wiki would work well
Fast Change (Daily to Weekly) - Projects underway, Conversations and Files should be the leading tabs
We acknowledge the customer demand for Private Channels and have been hard at work on it. Private Channels is currently in preview with a select group of customers. We expect to release the feature to the public later this Fall, and will update here when we are starting to roll out to all customers. We appreciate all the feedback you have provided to us on this forum and thank you for your patience.