AlwaysOn Architecture - SQL Server 2012 for creating a dev environment?
As Aaron Bertrand mentioned in his comment, AlwaysOn is only designed to support offloading of read-only operations, in addition to its (really neat) redundancy capabilities.

If all you're looking for is a place where your developers can check out the production data without putting load on the production server, then perhaps it's a technology that might be useful - but you can achieve pretty much the same thing with log shipping.

You can build out your dev environment from a standby server - whether it uses AlwaysOn, Mirroring or Log Shipping - by using a Storage Appliance that supports writeable snapshots, or a server that can present writeable snapshots via iSCSI (e.g. a ZFS server). However, you'll probably need extra servers for this, some latitude to mess around with your storage configuration, and possibly someone's shoulder to cry on while you're trying to set it up.

The little "Cloning" video on NetApp's SnapManager website provides a useful overview of how this works - unfortunately I can't seem to find a nice description that's not vendor-specific.