We’re aiming to bring it out of beta end of September/early October. First we’re following up on some of the feedback from this thread and other venues to make sure this is something developers feel comfortable adopting 
If it’s working for you, feel free to use it in production (we have several apps doing so already, including some of our most used internal apps). Technically we reserve the right to make breaking changes until it’s out of beta, but it’s looking unlikely we will actually do so.