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If you need something like EFS today, there is ObjectiveFS (https://ObjectiveFS.com), a posix cloud file system with S3 backend. Disclaimer: I am a co-founder :-)

For the record, there has never been anything stopping you from spinning up an NFS EC2 that all of your other EC2s can use.

Except that your one EC2 instance is a single point of failure, from instance through host through availability zone, and that providing reliable, multi-node NFS is hard (even with GlusterFS).

And you have to resize your block devices to store more stuff.

And...

:-)

Well, this is a problem with a lot of ephemeral services hand-spun on AWS. There are also ways of mitigating it on your instances, but those are clunky, too.

Which is why new services like these are always preferable.

This may be a problem for this new service as well, but with windows isn't there a problem getting a network drive to mount without a user physically logging into the machine?

I believe it is to be released Summer 2015. I've applied for the Preview though.

For what it's worth, We've found that if you contact your account manager @ AWS, the preview access requests can be pushed through faster.