Until now the amount of storage available to Premium elastic pools in Azure SQL Database was limited to 750 GB. We are pleased to announce that this limit has increased to 4 TB for the largest Premium pools.
Currently, this extra storage is available in the following regions: East US 2, West US, West Europe, Southeast Asia, Japan East, Australia East, Canada Central, and Canada East. More widespread availability is planned.
Learn more about it on the Azure blog.