You may be already aware of Cloud Shell, a feature introduced with Azure allowing you to run PowerShell commands directly from the web browser (https://shell.azure.com/), which then has been extended to allow you to also connect to Exchange Online.
Well, now it is the turn of Office 365 as Cloud Shell just makes his appearance in the Office 365 administration portal (https://admin.microsoft.com/).
To be able to get and use Office 365 Cloud Shell you need to have turn on the new admin center
Then you will see the Cloud Shell option at the top bar (just left to your admin account)
From there you can then use any Azure or Exchange Online PowerShell; I’m sure the Office 365 ones (and maybe SharePoint Online and Teams) will come in a near future.