I have been tracking this thread for a long time, I have a good article about this feature in the Azure Stack Preview release,
https://azurestack.eu/2015/06/microsoft-azure-stack-storage-explained-part-i/
It's good to read what to expect and how to prepare for your Azure storage repository. I am very worried about this feature, as it will certainly reduce the maintenance cost per ton of HA file servers for each team. Having a self-service portal for secure HA file management at the local level should put a smile on many IT admins !.
Hope the answer helps. Please take a look at the article. This is not for the faint of heart, as it is very deep and heavy :), but worth the beautiful photos.
Help with joy !, your real - CB