SharePoint Online now allows up to 1TB of storage for OneDrive for Business and SharePoint site collections in Office 365.
An administrator can specify which specific users they want to assign new upper quotas of 50GB, 100GB, 250GB, 500GB or 1TB quota. The catch to this is once the default quota of 25GB for a user is exceeded you will be pulling storage out of the overall pooled tenant storage allocation (10GB + 500MB x total number of users) in the tenant.
If you have 10,000 A2 licensed users that equals 5TB of pooled tenant storage available.
You decide to up OneDrive for Business quota from default 25GB to 250GB for 4 users which consumes 1TB out of the 5TB leaving 4TB remaining of the overall pooled storage.
You can purchase more pooled tenant storage at a per GB / per Month charge if you require more.
The SharePoint site collection limit has also been upped from 100GB to 1TB max and the 25TB max SharePoint Online limit in a single tenant has been removed which means you can purchase as much pooled storage as needed in your tenant.
Source: Microsoft Education in the Cloud