We are of course aware of the fact that Steam Direct is out now. We're reading through all the documentation right now and are preparing for the signing process, I think we'll hold off just a few days to let the platform settle in but we'll let you know once we've made tje submission!
By the way, I'm writing this from a B737-800 (Norwegian) currently cruising at 10000 meters. Gotta say the forum performs pretty well even from this altitude!
Edit: Yes, the september date has nothing to do with any actual release. It's a requirement from the back-end.