Additional meeting and call-related features and issues within Microsoft Teams for business
Teams is quite literally the new Small Business Server.
They'll take 10 years trying to make a bunch of separately developed platforms all work together in a way they were never designed to at outset, with a shiny but buggy interface. (onedrive, skype, yammer, sharepoint...).
When they reach the point of it finally working well, with good performance and bugs ironed out, they'll pull the plug for a brand new product line and start again from scratch.