If, unlike me, you are lucky enough to have a large storage pool in SharePoint Online it is now possible to assign 1024 GB / 1 TB to OneDrive for Business Office 365 users. If you don't buy more storage each E user still gets 25 GB of personal storage and adds 500 MB to the overall pool.
This started rolling out a week or so back, keep an eye out for it. I believe the maximum amount of storage which can be purchased per tenant is 25 TB... that is for now I guess.
More information on SharePoint Online and OneDrive for Business limits can be found here.