Starting on July 1 and over the next week, the OneDrive for Business storage limit for each user will be increased from 25GB to 1TB. As a part of this, any extra storage previously assigned to OneDrive for Business sites above 25 GB will be returned to the shared storage pool. Because all users will be moved to 1 TB, you no longer need to manage the OneDrive for Business storage limits. No action is required from you as these changes will be automatically applied.

Source: Office Blog