are you sure about that? My local newspaper is reporting that although the Apple IPhone 5S will be in revealed on the 10th, it won't go on sale until the 20th.
Source: The Daily Herald, Arlington Heights, IL.
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I agree with you Tander that there will be no Beta 7.
In fact Beta 6 was nice and Stable on my Model Number 1429 (Sprint) IPhone 5 and my Model Number 1455 (Sprint) IPad Mini.
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I also agree with you that the GM may get released on the 10th, but only to Apple Developer's. The General Public will have to wait until the IPhone 5S goes on sale on the 20th to get the GM.