Hello from the Office 365 Groups Engineering Team

catching up after vacation, I can respond to this:

>>When will we be able to see and manage the site collections created by office 365 groups?

right now!  You can use SharePoint Online PowerShell commands Get-SPOSite and Set-SPOSite to see any site, including those created as part of a group.  The actions on these sites are limited today to only setting storage, because other options (owners, guest policy, delete/un-delete) are controlled by the group object in AAD.

We are working on also making these sites appear in the SharePoint Tenant Admin web interface.

Always happy for feedback on how we can improve manageability!