It's finally here!
Amazon Web Services (AWS) just announced that the Elastic File System (or "EFS") is a live production service. The service is provisioned out of three regions currently: US-EAST-1, US-WEST-2, and EU-WEST-1.
EFS was originally announced over a year ago at AWS re:Invent in 2015. By AWS standards, the service has been in "preview" for quite some time. I'll admit to you, I was getting a little skeptical that it was going to make it out of preview, but hey, it's good to be wrong sometimes.