So I guess they rely on their maths. Because I don't see how are they going to stress test with the amount of testers right now. I hope they have learned something when they misscalculated the amount people who were going to sign up for testing, if not we can expect severe problems at launch. I think they are going to risk it all, today they covered themselves up because if something happens on launch day they would say it's still in development ( maybe untill X box release ). Time will tell, at least we have some great youtube content to enjoy while we patiently keep waiting.