Thank you for your continued feedback. The feature team is actively working on this feature as well as doing work to give users the choice to open Word/Excel/PowerPoint files by default in Browser, Office app or inside the Teams app. We will share an update here as soon as one is available.
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.
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.