To change the email address of the group, follow the best answer here: https://answers.microsoft.com/en-us/msoffice/forum/msoffice_o365admin-mso_exchon-mso_o365b/how-to-add-an-email-alias-to-an-o365-group/79d94383-442a-4e3a-ac62-4ff1ea8af962.
We’re working on renaming the Team Site. Stay tuned.Anonymous commented
It's important that we can rename Teams, and their underlying components such as group and URL reflects the change. Having a new group without a New URL is NOT LOGICAL!!