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People spend way to much time analyzing when apples events will be. Just wait why does it matter if its the 28, 29 August September it makes no difference
 
It's highly unlikely that the new phone will be released at the same time the new OS is announced. Developers need time to update their apps and get to grips with the new features.

If the phone was scheduled for a WWDC release in June, you should expect a March announcement for the OS and that's looking very unlikely now.
 
iOS 7 will most likely come in the summer. If not, iPhone 5S will come with it in August/september/early October.
 
Theres not chance Apple will hold it on a saturday. If anything is going to be announced in June, it will be during WWDC which usually begins on a Monday. Even a standalone iPhone announcement would be on a weekday.
 
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