When Aura framework will be available in Dev Orgs?

I know that some functionalities of Salesforce are already using Aura, and there is also the version for Java: https://github.com/forcedotcom/aura.

I am starting a new project, and I wonder if I need to consider Aura in a short term.

Does anybody know when Aura will be available on production Orgs?

Thanks in advance.