These are great announcements! I especially like seeing how easy it will become to select a design for a new site and being able to connect Office 365 Groups to existing sites.
We want to plan as best we can for these changes as we are currently in the midst of a rollout of Office 365 and Sharepoint and theses new capabilities will have serious impact on how we go about doing things.
My first question is: will the new "designs" be a kind of template? As in: will they only contain visual components or will they also control other aspects such as menu structure, types of apps within a site, columns in a given document library, etc?
Second question: will designs be available for new sites across site collections?
Third question: When connecting an Office 365 Group to an existing site, will it work for any site in any site collection? Or will we have to make sure we only have one site per site collection - like those sites that are rolled out automatically with an Office 365 Group?