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 continues to be on our backlog due to prioritization of other work items. We will update when there is more to share.