Azure Premium Files is now available in limited preview

Azure Premium Files provides fully managed file services, optimized to deliver consistent performance at 100 times improvement from the existing Azure Files. It’s designed for IO intensive enterprise workloads that require high throughput and a single digit millisecond latency. With the introduction of Premium Files, Azure now offers you a choice for two types of shared files storage to fit your workload needs—premium and standard.
Source: Azure Roadmap