This continues to be on our backlog due to prioritization of other work items. We will update when there is more to share.
Improvements to day/work week/week view are in the public ring. Our focus now is a new scheduling experience and scheduling assistant, appointments and more.
For feedback related to Group Calendar please see this User Voice item: https://microsoftteams.uservoice.com/forums/555103-public/suggestions/16933204-include-office-365-group-calendar-in-teams.
This is working today in the web client on Edge & Chrome. The team is actively investigating feasibility in the desktop client.
Great performance and user experience remain a topmost priority for us. Application launch time has seen improvements in the recent build. We will continue making improvements across the product including channel to chat switching and overall resource consumption.
We are working on a design with more density in mind. Until this design is solidified we are putting this item back to Under Review.
The team continues to make progress on this. We will share more details as we have them.