The new SharePoint Online, available with Office 365, includes a wide variety of improvements and new features.
Discover how SharePoint Online can help you share your work and work with others, organize your projects and teams and discover people and information.
Read more here.
On top of the above you might also want to check out how you as an Admin can automate SharePoint Online management tasks using remote Windows PowerShell, e.g. create a bunch of sites from code.
See the article "The new SharePoint Online Administration Center—more customer control" here