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Last 3 betas have all 'seemed' like GM seeds. But they keep rolling out more betas. Apple is becoming unpredictable again.
 
Release notes mentions "A user updating to an iOS 9 GM build from a seed build may see.."

Was that line in beta 3 notes? If not, I'd say this is the GM.
 
There is not way Beta 2 could have been considered a GM candidate with all that lag. It was noticeable right away
 
There is not way Beta 2 could have been considered a GM candidate with all that lag. It was noticeable right away
Its possible the lag was an oversight and Apple didn't catch it. Which is why Beta 3 and now Beta 4 are out. To make sure that its taken care of. No issues thus far with Beta 4.
 
There have been A LOT of app updates lately; seems like a logical indicator that a new iOS version is ripe for release?
 
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