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Every 2 weeks a new beta is released. We are due for Beta 4 on the 27th of October.

2 weeks after that we will either see a beta 5 or the official release.

Nov 10th could possibly be the day, otherwise it's the 24th.

I *highly* doubt there will be 6 beta versions...5 at the most. If there were 6 beta's, then the official release would likely be on Dec 8th, which is very unlikely.
 
at the rate the 4,2 beta's are (unstable) it will take atleast another 2 beta releases to work out the kinks. 4.2B1 for the 3GS was the best release and they had the mix correct but since the first beta its gotten much worse. The betas for the iPhone 4 from what I have read is a sad state of affairs.
 
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