On December 19, 2013, Intuit announced that they are supporting integration. It looks like they are handling integration by "Publishing to Your Private Channel"; same path as publishing an app on their Apps.com but will less requirements and approvals.
https://developer.intuit.com/blog/2013/12/19/2014-roadmap-and-migration-dates-for-existing-developers
What's more, they are expecting all QBOE customers to migrate to their new v3 API by March 15, 2014. If you don't, your existing integration will fail once they migrate your company to their new "Harmony" version. They plan to migrate everyone over to harmony by July.
This is a aggresive timeline so I would not be surprised if the dates slip.